I have a ProBook HP laptop with 12.04 (PB-1), it connects to the WIFI and works fine. Now, I have just installed another ProBook  (PB-2) with 14.04 (not 12.04), also connected to the WIFI, and sometimes this second computer loses or slows down dramatically its connectivity. The router is configure with DHCP, and, as I can see with ifconfig, they have different IP addresses (192.168.1.41 and 192.168.1.34). Eventually, other computers/mobile devices get connected to the network, but always with different numbers, so it doesn't seem to be a collision problem.  The laptop has a fresh installation, didn't change anything in its configuration.  I've checked that there's an interaction between both laptops. Most of the times, PB-2 can't access if PB-1 is connected (but once I could do a speed test of both connected at the same time, and yielded similar results). Verified with firefox and chrome. (Of course, PB-1 is not heavy-downloading anything, this lasts for a week, since I first installed 14.04.)  Edit:   00:19.0 Ethernet controller  [0200]: Intel Corporation 82579V Gigabit Network Connection  [8086:1503] (rev 04) Subsystem: Hewlett-Packard Company Device  [103c:1621] Kernel driver in use: e1000e -- 24:00.0 Network controller  [0280]: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter  [14e4:4727] (rev 01) Subsystem: Hewlett-Packard Company Device  [103c:145c] Kernel driver in use: wl    The only difference is at the very end of the message: wl for the first ProBook (the one working fine), and bcma-pci-bridge for the second one (slow).  Edit:  The Broadcom Wireless Card indentified for both laptops is  [14e4:4727] (rev 01)  corresponding to this entry in the PCI.ID table:  PCI.ID              12.04 LTS                      14.040 / 14.10 LTS  ------------------------------------------------------------------------------------     14e4:4727           Special Case #3                 Special Case #1       which reads as:  Special Case #1 - This device uses the driver combination bcma and brcmsmac. It shouldn't be necessary to install anything at all. Required firmware is installed by default in the package linux-firmware.  Wireless script  for PB-1.  Wireless script  for PB-2.  Wireless script  for PB-1 after removing the STA driver.  Edit:  HW configuration of both ProBooks:   7,7GiB memory Intel Core i5-2410M CPU @ 2.30GHz x 4 Intel Sandybridge Mobile 64-bit plenty of disk in PB-2, same HD in PB-1, but here there's only some 1GB left (sharing with Windows).
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I'm having serious problems installing the Broadcom drivers for Ubuntu. It worked perfectly on my previous version, but now, it is impossible.   What are the steps to install Broadcom wireless drivers for a BCM43xx card?  I'm a user with no advance knowledge in Linux, so I would need clear explanations on how to make, compile, etc.    lspci -vnn | grep Network showed:   Broadcom Corporation BCM4322 802.11a/b/g/n Wireless LAN Controller [14e4:432b]      iwconfig showed:  lo        no wireless extensions. eth0      no wireless extensions.   NOTE: Answer below is updated every time new information is added and confirmed working.
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I recently bought a new computer that has an Atheros AR9485 wireless NIC. So far it has been working ok except this one issue: Randomly (as far as I can tell) it will completely lose the internet connection. The indicator in the top panel will still say we are connected but the machine has no internet connectivity whatsoever.    I've been able to get it working again by simply disconnecting from my wireless AP and then reconnecting, but this is annoying. Is there anything I can do to make the connection more stable?    I have tried passing the nohwcrypt=1 to the driver, but that made it impossible to connect to any AP, it just infinity attempted to connect.  sudo modprobe -rfv ath9k sudo modprobe -v ath9k nohwcrypt=1   I've also tried upgrading my kernel to Linux 4.0 but the problem persists.    Exact chip:  02:00.0 Network controller [0280]: Qualcomm Atheros AR9485 Wireless Network Adapter [168c:0032] (rev 01)     Driver:    $ ls /sys/class/net/wlan0/device/driver/module/drivers pci:ath9k  platform:ath9k     and lsmod:  user@host:~$ lsmod | grep -e ath -e ndis ath3k                  20480  0  bluetooth             491520  9 bnep,ath3k,btusb ath9k                 147456  0  ath9k_common           32768  1 ath9k ath9k_hw              458752  2 ath9k_common,ath9k ath                    32768  3 ath9k_common,ath9k,ath9k_hw mac80211              724992  1 ath9k cfg80211              540672  4 ath,ath9k_common,ath9k,mac80211    output from wireless script:    I'm running Ubuntu 15.04 on Linux 4.0.0-040000-generic on a Lenovo G510.   I'm wondering now if I could possibly have anything to do with my wireless mouse, which also operates on 2.4GHz..
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I've just decided to jump into the world of Ubuntu, so far I encountered no problems until I tried to connect to my wireless network. I'm running Ubuntu on my laptop, Acer Aspire 5333-2880, which has an Acer Nplify 802.11b/g/n wireless card.  After browsing for an answer, I think the problem is a missing driver. input:   lspci | grep Network   output:     02:00.0 Network controller; Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01)   I found a couple of answers that might be right, but I have problems with both of them.    It requires me to load the site in my laptop, but I can't do it without internet and I have no idea how to save this into a USB.  But I have no idea how to really run or use this, and I wouldn't like to screw it up.    Any advice or other possible solutions will be greatly appreciated!   EDIT.  Thanks a lot for your input Marko and Jorge. I am sure the problem was with one of the drivers, but I was too distracted, or tired yesterday to realize I didn't restart my computer after installing. As soon as I got turned on my computer again, it was working. Annoyingly, I am not sure what the problem was exactly nor what exactly fixed it.  But still, thanks a lot Marko for the intel on how to build packages, I am sure it will be very useful later on!
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I recently installed Ubuntu 14.04 on my Dell XPS 15 9530.  Now, everything except the wireless connection works fine. I've googled, and found  solution, but it didn't change anything for me (i.e. I added "options iwlwifi 11n_disable=1" to "/etc/modprobe.d/iwlwifi.conf").  I'm not sure what next steps I should take to solve this problem. I've read somewhere that updating the kernel might help I ran the command "uname -r" and got "3.13.0-24-generic" back, which implies i have the kernel version 3.13 and not the newest 3.18 according to .  If anyone has an idea what to try next or can point me somewhere, that would be awesome.
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I recently updated my Lenovo Y50 computer to 16.04. Since the update, I have been unable to see or connect to any wireless networks. The output of running sudo lshw -C network is:     *-network UNCLAIMED          description: Network controller          product: BCM4352 802.11ac Wireless Network Adapter          vendor: Broadcom Corporation          physical id: 0          bus info: pci@0000:08:00.0          version: 03          width: 64 bits          clock: 33MHz          capabilities: pm msi pciexpress cap_list          configuration: latency=0          resources: memory:d1600000-d1607fff memory:d1400000-d15fffff   The fact that the wireless network controller is unclaimed leads me to believe that this is a driver related issue. I have checked and made sure that "Use proprietary driver" is checked in System Settings > Software &amp; Updates > Additional Drivers and I have run sudo apt-get install --reinstall bcmwl-kernel-source I have also restarted after every driver change to finish the changes. Is there anything else I should try?  EDIT: Here is the result of running lspci -nnk | grep 0280 -A2:        08:00.0 Network controller [0280]: Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter [14e4:43b1] (rev 03)     Subsystem: Lenovo BCM4352 802.11ac Wireless Network Adapter [17aa:0623]     Kernel modules: bcma, wl   Running sudo modprobe wl &amp;&amp; dmesg | grep wl returns an error:      modprobe: ERROR: could not insert 'wl': Required key not available
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I have searched through the internet and in AskUbuntu, but I could not find a working solution for my little problem.  The RTL8723ae WLAN is behaving strangely on Ubuntu 14.04 and drops the WLAN connection constantly. I am using the notebook MSI GE40 and have already seen on the web that there are other people having the same problem but there was no permanent solution. The problem did not exists on the original Windows 8 on the device and the router is a TP-Link, which I can control (channel change and so on, I use WPA2-PSK WLAN security).
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My laptop is Dell Inspiron 17R 5720. My OS is Ubuntu 13.10. I was using WiFi before but one day it stopped working. Outputs of some commands:  enedil@enedil-Dell:~$ lspci -k | grep -A2 Broadcom 02:00.0 Network controller: Broadcom Corporation BCM43142 802.11b/g/n (rev 01) Subsystem: Dell Wireless 1704 802.11n + BT 4.0 Kernel driver in use: wl   enedil@enedil-Dell:~$ rfkill list all 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no 1: brcmwl-0: Wireless LAN Soft blocked: no Hard blocked: no 2: hci0: Bluetooth Soft blocked: no Hard blocked: no   enedil@enedil-Dell:~$ lsmod | grep wl wl                   4207760  0  cfg80211              480503  1 wl lib80211               14381  2 wl,lib80211_crypt_tkip   enedil@enedil-Dell:~$ uname -a Linux enedil-Dell 3.11.0-15-generic #23-Ubuntu SMP Mon Dec 9 18:17:04 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux   enedil@enedil-Dell:~$ lspci -vvnn | grep 14e4 02:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n     [14e4:4365] (rev 01)   I don't know what to do, especially that yesterday, I changed my Internet connection to wireless.  EDIT: When I click on network applet (I'm using Unity) I see message under grey Wi-Fi: Device unsupported.
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I recently upgraded to Ubuntu 13.04 from Ubuntu 12.10. However, since then although my wireless network is detected, I cannot connect to it.  Ubuntu keeps on trying to reconnect with the network but is not successful. Same machine on Windows 8 I am able to connect to the same wireless network.  Also, Ethernet is working fine as I am able to connect to the same network through Ethernet on Ubuntu.  My lspci -nn output is   12:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller [14e4:4727] (rev 01) 13:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd.                RTL8101E/RTL8102E PCI Express Fast Ethernet controller [10ec:8136] (rev 02)   I already tried the solution in this post  but it not solving my problem. The situation is the same.  Please help me. I do not want to switch to using Windows again.
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I did a fresh install of Ubuntu 16.04.3 on my laptop, which is also running Windows 10. The install was successful and during the process I was able to connect to my wifi network with no issues (I can still do so when using Windows) - but now I can't see any networks at all when trying to select one. I can use a wired connection.  Using sudo lshw -C network, I get:  *-network                   description: Ethernet interface    product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller    vendor: Realtek Semiconductor Co., Ltd.    physical id: 0.1    bus info: pci@0000:01:00.1    logical name: enp1s0f1    version: 12    serial: 80:fa:5b:35:06:d7    size: 1Gbit/s    capacity: 1Gbit/s    width: 64 bits    clock: 33MHz    capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation    configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8411-2_0.0.1 07/08/13 ip=192.168.0.21 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s    resources: irq:127 ioport:e000(size=256) memory:df214000-df214fff memory:df210000-df213fff *-network UNCLAIMED    description: Network controller    product: Wireless 8260    vendor: Intel Corporation    physical id: 0    bus info: pci@0000:02:00.0    version: 3a    width: 64 bits    clock: 33MHz    capabilities: pm msi pciexpress cap_list    configuration: latency=0    resources: memory:df100000-df101fff   I thought it was maybe an issue with missing drivers because the driver is unclaimed, so I copied the driver for 8260 from  to /lib/firmware, but still nothing.  I've tried a couple of other solutions, such as checking for software updates and additional drivers, but so many are for previous versions, so I've found that they haven't made any change. The kernel version is 4.13.0-1015-oem if that helps at all.  Results from terminal:  lspci -nnk | grep 0280 -A3 02:00.0 Network controller [0280]: Intel Corporation Wireless 8260 [8086:24f3] (rev 3a) Subsystem: Intel Corporation Wireless 8260 [8086:1010] Kernel modules: iwlwifi 03:00.0 Non-Volatile memory controller [0108]: Intel Corporation Device [8086:f1a5] (rev 03)  $ sudo modprobe iwlwifi &amp;&amp; dmesg | grep iwl [   15.839409] iwlwifi 0000:02:00.0: enabling device (0000 -&gt; 0002) [   15.857552] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-    33.ucode failed with error -2   [   15.857562] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-32.ucode failed with error -2 [   15.857568] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-31.ucode failed with error -2 [   15.857573] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-30.ucode failed with error -2 [   15.857579] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-29.ucode failed with error -2 [   15.857584] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-28.ucode failed with error -2 [   15.857590] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-27.ucode failed with error -2 [   15.857595] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-26.ucode failed with error -2 [   15.857600] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-25.ucode failed with error -2 [   15.857605] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-24.ucode failed with error -2 [   15.857612] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-23.ucode failed with error -2 [   15.857618] iwlwifi 0000:02:00.0: Direct firmware load for iwlwifi-8000C-22.ucode failed with error -2 [   15.857619] iwlwifi 0000:02:00.0: no suitable firmware found! [   15.857621] iwlwifi 0000:02:00.0: minimum version required: iwlwifi-8000C-22 [   15.857622] iwlwifi 0000:02:00.0: maximum version supported: iwlwifi-8000C-33 [   15.857623] iwlwifi 0000:02:00.0: check git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
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On my brand new Lenovo P50 the wifi is unstable. sometimes it connects, sometimes it does not, or just stops working. Sometimes wifi networks are shown in the network manager, sometimes not. Sometimes even the wifi symbol disappears and changes to the symbol with the two arrows, even when no ethernet cable is connected.  sudo service network-manager restart   solves the problem for a while, but it comes back.  Hardware is Lenovo P50,    wifi adapter intel 8260 rev 3a  Ubuntu 16.04 with all updates installed as of today  Kernel 4.4.0-28-generic  driver is iwlwifi driverversion=4.4.0-28-generic firmware=16.242414.0  sudo lshw -C network   gives  *-network                   Beschreibung: Kabellose Verbindung    Produkt: Wireless 8260    Hersteller: Intel Corporation    Physische ID: 0    Bus-Informationen: pci@0000:04:00.0    Logischer Name: wlp4s0    Version: 3a    Seriennummer: 44:85:00:df:1f:b5    Breite: 64 bits    Takt: 33MHz    Fähigkeiten: pm msi pciexpress bus_master cap_list ethernet physical wireless    Konfiguration: broadcast=yes driver=iwlwifi driverversion=4.4.0-28-generic firmware=16.242414.0 ip=192.168.1.39 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn    Ressourcen: irq:133 memory:c4c00000-c4c01fff *-network    Beschreibung: Ethernet interface    Produkt: Ethernet Connection (2) I219-V    Hersteller: Intel Corporation    Physische ID: 1f.6    Bus-Informationen: pci@0000:00:1f.6    Logischer Name: enp0s31f6    Version: 31    Seriennummer: 50:7b:9d:fe:e7:83    Kapazität: 1Gbit/s    Breite: 32 bits    Takt: 33MHz    Fähigkeiten: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation    Konfiguration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k firmware=0.8-3 latency=0 link=no multicast=yes port=twisted pair    Ressourcen: irq:130 memory:c5700000-c571ffff
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As my laptop does not have Ethernet port, to set up wireless, I need to install drivers offline.  My Ubuntu version is 14.04.3, and kernel version is 3.19.0-25-generic.   Output of the command:  lspci -knn | grep Net -A2:   is:   01:00.0 Network controller [0280]: Intel Corporation Wireless 8260 [8086:24f3] (rev 3a)     Subsystem: Intel Corporation Dual Band Wireless-AC 8260 [8086:0010]   Since here:    it is suggested to try following these steps:     I tried, but without any success.  Now I am not sure what to try next. I am not Ubuntu expert, and would appreciate any help.  Thanks a lot in advance.
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I have Intel Centrino N 2230 WiFi card and I tried to download iwlwifi tar from Ubuntu wireless drivers and then I copied its .ucode to firmware folder and then I ran modprobe -r lawgn and modprobe lawgn. It didn't run, even after restart. Then I updated the compat-drivers but still didn't work.  I tried rfkill unblock all, checked the button, etc. but it didn't show up in airmon-ng and iwconfig.  Can anyone kindly help?  This is the output of mine:  lshw -C network   *-network                   description: Ethernet interface    product: RTL8111/8168B PCI Express Gigabit Ethernet controller    vendor: Realtek Semiconductor Co., Ltd.    physical id: 0.2    bus info: pci@0000:07:00.2    logical name: eth0    version: 0a    serial: 28:92:4a:1d:af:a1    size: 100MB/s    capacity: 1GB/s    width: 64 bits    clock: 33MHz    capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation    configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full ip=192.168.1.3 latency=0 link=yes multicast=yes port=MII speed=100MB/s    resources: irq:41 ioport:2000(size=256) memory:61404000-61404fff memory:61400000-61403fff *-network UNCLAIMED    description: Network controller    product: Intel Corporation    vendor: Intel Corporation    physical id: 0    bus info: pci@0000:08:00.0    version: c4    width: 64 bits    clock: 33MHz    capabilities: pm msi pciexpress bus_master cap_list    configuration: latency=0    resources: memory:61500000-61501fff  iwconfig   lo        no wireless extensions. eth0      no wireless extensions.  airmon-ng    Interface   Chipset     Driver  lsb_release -a; uname -a   No LSB modules are available. Distributor ID: Ubuntu Description:    Ubuntu 10.04.2 LTS Release:    10.04 Codename:   lucid Linux bt 2.6.38 #1 SMP Thu Mar 17 20:52:18 EDT 2011 i686 GNU/Linux
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We have a HP Proliant DL360P with one Intel Xeon e5-2650, and we was in need to use two Xeon e5-2670 V2, this server by default this G8 did not recognizes the v2 processor, so we found  so we did the BIOS Firmware update to most recently (2014) and after we did the processor self-upgrade procedure as described on the link.  Changed the processor and it worked, and after a power-off / power-on it did not booted, in the SID panel it said that the processor was the fault, so we changed back the processor to the e5-2650, and it keept saying that the processor was the fault.  We removed the batery to clear the BIOS and after it botted but appeared a very mess strange characters in the display.  I'm now downloading the Firmware maintenance v10.1 from FTP of HP to make the procedure  but I want to check with you if with your knowledged if you now something about it
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I have just installed Ubuntu 20.04 and I am facing a pretty big issue. My download speeds are really low compared to the Windows 10 that I have installed on dual-boot setup.   This is the speed I'm getting in Windows.    And this is what I'm getting in Ubuntu.   My network adapter is Lenovo RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller.   I have tried changing the DNS options but that doesn't help.  Device is a Lenovo Y700-15ISK Laptop.  Output lshw:  *-network DISABLED        description: Wireless interface        product: QCA9377 802.11ac Wireless Network Adapter        vendor: Qualcomm Atheros        physical id: 0        bus info: pci@0000:08:00.0        logical name: wlp8s0        version: 30        serial: cc:b0:da:b7:60:65        width: 64 bits        clock: 33MHz        capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless        configuration: broadcast=yes driver=ath10k_pci driverversion=5.4.0-29-generic firmware=WLAN.TF.2.1-00021-QCARMSWP-1 latency=0 link=no multicast=yes wireless=IEEE 802.11        resources: irq:142 memory:94000000-941fffff   *-network        description: Ethernet interface        product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller        vendor: Realtek Semiconductor Co., Ltd.        physical id: 0        bus info: pci@0000:09:00.0        logical name: enp9s0        version: 15        serial: c8:5b:76:3e:55:50        size: 1Gbit/s        capacity: 1Gbit/s        width: 64 bits        clock: 33MHz        capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation        configuration: autonegotiation=on broadcast=yes driver=r8168 driverversion=8.048.00-NAPI duplex=full ip=192.168.100.2 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s        resources: irq:131 ioport:3000(size=256) memory:94304000-94304fff memory:94300000-94303fff   Also, the ifconfig shows a lot of dropped RX packages that are increasing as we speak:
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My wifi card is an Intel® Wireless-AX200 (802.11/a/b/g/n/ac/ax), Bluetooth® 5, and bluetooth is working. I've tried following various guides, however these drivers are apparently yet to make it into the kernel.  Their product brief states linux is supported:    And yet their driver page has no listing for them:    sudo lshw -c network =&gt; mark@m-blade-2019:~$ sudo lshw -c network   *-network UNCLAIMED               description: Network controller        product: Intel Corporation        vendor: Intel Corporation        physical id: 0        bus info: pci@0000:02:00.0        version: 1a        width: 64 bits        clock: 33MHz        capabilities: pm msi pciexpress msix cap_list        configuration: latency=0        resources: memory:cf300000-cf303fff   *-network        description: Ethernet interface        physical id: 2        logical name: enx0050b6b47e72        serial: 00:50:b6:b4:7e:72        capabilities: ethernet physical        configuration: broadcast=yes driver=cdc_ncm driverversion=22-Aug-2005 firmware=CDC NCM ip=192.168.1.17 link=yes multicast=yes   I'm running kernel version Linux 5.0.0-13-generic, any help is greatly appreciated.  EDIT: results of lspci -nnk | grep 00280 -A3:  mark@m-blade-2019:~$ lspci -nnk | grep 0280 -A3 02:00.0 Network controller [0280]: Intel Corporation Device [8086:2723] (rev 1a)     Subsystem: Intel Corporation Device [8086:0084]     Kernel modules: wl, iwlwifi 03:00.0 Non-Volatile memory controller [0108]: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981 [144d:a808] mark@m-blade-2019:~$
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I just upgraded from Ubuntu 18.04 to 20.04 on one of the  machines, and the network performance is abhorrent. Internet speed is very fast from a google speed test (>300Mb/s for both upload and download).     However, whenever I try to browse a website or even run sudo apt update the connection will often time out. My internet is very fast on all other devices and I really don't know how to debug this problem.  sudo lshw -class network -short &amp;&amp; nmcli device status    shows  H/W path           Device           Class          Description ============================================================== /0/100/1c.6/0      wlp2s0           network        Wi-Fi 6 AX200 /3                 br-96f5b790e29e  network        Ethernet interface /4                 br-15e76fb81c05  network        Ethernet interface /5                 docker0          network        Ethernet interface  DEVICE           TYPE      STATE         CONNECTION       wlp2s0           wifi      connected     CSA HQ           br-15e76fb81c05  bridge    connected     br-15e76fb81c05  br-96f5b790e29e  bridge    connected     br-96f5b790e29e  docker0          bridge    connected     docker0          p2p-dev-wlp2s0   wifi-p2p  disconnected  --               lo               loopback  unmanaged     --               gpd0             tun       unmanaged     --                Solution:  It seems like this is a pretty common problem, and one without a definitive cause. For me, it was because Ubuntu resets the TLP configuration, and the power management went back to "on". I disabled Wi-Fi power management directly by editing:  sudo nano /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf   Then changed the value from 3 to 2, saved changes and rebooted.  I actually got this solution from Reddit and this worked for my case specifically but it seems like it could be caused by a bunch of other things. Read all the proposed solutions below!
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Hey guys I'm having some issue with my rtl8188ee network card. On Windows I get ~30-40 Mb/s whereas on Ubuntu 15.04 I get ~5 Mb/s. However, the issue comes and goes; often after disconnecting and reconnecting my WiFi temporarily jumps to the proper speed, only to recede again shortly.   In search for an answer I came across ; however I was unable to properly compile the driver (here's  I get when running make).  I was wondering if anyone knew how I could manage to compile the driver properly, or if anyone has another way to fix the slow WiFi speeds in Ubuntu 15.04.  In order to give as much information as possible, here are some diagnostic information:  uname --all:  Linux david-Lenovo-H535 3.19.0-21-generic #21-Ubuntu SMP Sun Jun 14 18:31:11 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux   lshw -C network:  *-network                   description: Ethernet interface    product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller    vendor: Realtek Semiconductor Co., Ltd.    physical id: 0    bus info: pci@0000:01:00.0    logical name: eth0    version: 09    serial: c0:3f:d5:72:be:6c    size: 10Mbit/s    capacity: 1Gbit/s    width: 64 bits    clock: 33MHz    capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation    configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168f-1_0.0.5 06/18/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s    resources: irq:46 ioport:e000(size=256) memory:d0004000-d0004fff memory:d0000000-d0003fff  *-network    description: Wireless interface    product: RTL8188EE Wireless Network Adapter    vendor: Realtek Semiconductor Co., Ltd.    physical id: 0    bus info: pci@0000:04:00.0    logical name: wlan0    version: 01    serial: 28:e3:47:60:76:6f    width: 64 bits    clock: 33MHz    capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless    configuration: broadcast=yes driver=rtl8188ee driverversion=3.19.0-21-generic firmware=N/A ip=10.0.0.14 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn    resources: irq:48 ioport:d000(size=256) memory:fea00000-fea03fff     Edit  I successfully installed the new driver thanks to @Pilot6 but problem persists. For more information, my download is the only speed affected. Upload is consistent at 10 Mb/s. I really have no clue what to do at this point. I know the hardware is fine because in Windows I don't have any issues with wireless.  Second Edit  Disabling IPv6 worked for a while but speeds dropped back down again. Problem remains intermittent. I don't think this has to do with the wireless repeater I'm using because all other devices work fine. Further, upload speeds have been entirely consistent, so I doubt it has to do with the signal or interference.  Alas, 5 Mb/s is sufficient for my daily routine. I only hope a future update will solve the problem.