I have Ubuntu 14.04. After having updated the system to kernel 3.13.0-49-generic, I re-booted and now everything freezes! I cannot log in. (Keyboard and mouse do not work as well)  I found this line in my kern.log when I first rebooted after kernel update:  segfault at 0 ip 00007f2d1fabd0c8 sp 00007f2d02ef7500 error 6 in libcontent.so[7f2d1f178000+141f000]   This error appeared once in the first time I wanted to reboot after updating the kernel.  I came across .  And I uninstalled my chrome browser and rebooted again. But no luck.   Anything else that I need to check?
4936
The latest kernel is causing problems with my sound, which worked fine with an older version. As I have only Ubuntu installed, Grub is not getting displayed while booting. How can I manually choose my kernel version while booting?
68841
Can you guys please help me use Grub Customizer to set an older version of the kernel 4.4.0 of Ubuntu 16.04 LTS as default when booting? I'm not using a dual boot system, and I have installed 4.4.8 kernel to help me solve the suspend problem, but it's draining my battery.  What do I have to do, I wouldn't want to f*** things up.
87598
Ubuntu 16.04 has been hanging on me ~1x per day.  This happens when I am in the middle of web browsing or using a desktop application, not when booting.  When it does, the mouse pointer will still move freely, but clicking or keystrokes have no effect on my system until I do a hard reboot.  What is the best way for me to debug this?  Here is some information:  selah@selah-Precision-Tower-5810:~$ uname -a Linux selah-Precision-Tower-5810 4.4.0-59-generic #80-Ubuntu SMP Fri Jan 6 17:47:47 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux   Also, in case it is relevant, I have a "very big" monitor, a Dell 42" at 3840x2160 resolution.  selah@selah-Precision-Tower-5810:~$ lspci | grep VGA 03:00.0 VGA compatible controller: NVIDIA Corporation GM107GL [Quadro K2200] (rev a2)     UPDATE:  Following Artyom's advice I found the following message in my error logs:   Apr 27 09:47:25 selah-Precision-Tower-5810 kernel: nouveau 0000:03:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT] Apr 27 09:47:29 selah-Precision-Tower-5810 kernel: nouveau 0000:03:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT] Apr 27 09:47:33 selah-Precision-Tower-5810 kernel: nouveau 0000:03:00.0: fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]   Which has let me to this bug which describes similar behavior:
90780
I upgraded my kernel today with ukuu, and since then I cant boot because i'm getting this errors:   error: /boot/vmlinuz-4.18.12-041812-generic has invalid signature error: you need to load the kernel first   I have dual boot with windows 10 and ubuntu 18.10 (Upgraded today)  Update: I managed to boot to older kernel that i chose from "Advanced  options for Ubuntu" in grub  But I need to upgrade my kernel and if I do that I still get the same problem...
34220
The error message is      This kernel requires an x86-64 CPU,but only detected an i686 CPU. Unable to boot - please use a kernel appropriate for your CPU.   How can I overcome this?
27665
I'm running the current stable Ubuntu version (Oneiric) but have issues with the shipped kernel. Newer kernel versions seem to have fixed it, but the kernel-ppa/ppa does not contain the most recent kernel which is why I want to install the kernel from the next stable version (Precise). Since I want to be able to unload out of tree kernel modules, the mainline kernel from  cannot be used.  I also have have Virtual Box installed which also need to work in the new kernel so the "kernel headers" have to be upgraded as well.  How am I supposed to install the kernel packages from the next stable version (Precise) without upgrading all other packages?
97926
I have a , with Ubuntu 16.04 installed.  I have recently (today) updated it(not upgraded), and afterwards it asked for a reboot, so I did that. However, after reboot it showed the login screen and mentioned connection established (for internet through Ethernet), and login password cursor was blinking during that time but after that even the cursor stopped blinking and accepting no response from keyboard or mouse. Only one option is to force shutdown. I have no idea what part of the update resulted in this.   Everything was working fine before the update. Once the Ethernet icon announcing connection has been established goes away, it takes away the blinking of the cursor, then keyboard and mouse simply won't work. I even tried connecting keyboard on other slots, but no success. Can I uninstall the last update?  NOTE:  I heard a sound from the processor when login screen comes and in between the cursor also blinks, but once this sound is over then the blinking freezes and you have to forcibly shutdown, as this is an institute computer (I took the admin privilege, headache). Now I am  really worried about it. How to fix it?  IMPROVEMENT  I did not have to go for a live USB, and I was able to go to grub I was able to go to the GRUB menu by pressing the Esc key). This what I got.      I have no idea how to go about it after that. It is saying Secure boot forbids loading module, while loading Ubuntu I did secure boot by entering a password for that.
92182
Today my iptables nat on the host system stopped working and I have no clue what happend! (That's very bad, I know)  All commands are executed as root user.  If I run $ iptables -t nat -L I get the following error message:  $ iptables -t nat -L iptables v1.4.7: can't initialize iptables table `nat': Table does not exist (do you need to insmod?) Perhaps iptables or your kernel needs to be upgraded.   There are no further updates available. I also restarted the server with several older kernels, but I always get the same error message.  My server is running on CentOS with the official OpenVZ kernel in the latest version.  $ uname -r 2.6.32-042stab088.4   Also tested kernel version: 2.6.32-042stab85.20 and 2.6.32-042stab084.26  First kernel in grub.conf:  title OpenVZ (2.6.32-042stab088.4) root (hd0,1) kernel /vmlinuz-2.6.32-042stab088.4 ro root=/dev/md2 rd_NO_LUKS rd_NO_DM nomodeset crashkernel=auto SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8 KEYTABLE=de initrd /initramfs-2.6.32-042stab088.4.img   The following updates were installed:  $ rpm -qa --last vzctl-4.7.2-1.x86_64                          Mon 05 May 2014 03:25:16 AM CEST vzctl-core-4.7.2-1.x86_64                     Mon 05 May 2014 03:25:14 AM CEST util-linux-ng-2.17.2-12.14.el6_5.x86_64       Wed 30 Apr 2014 11:37:19 PM CEST libuuid-2.17.2-12.14.el6_5.x86_64             Wed 30 Apr 2014 11:37:18 PM CEST libblkid-2.17.2-12.14.el6_5.x86_64            Wed 30 Apr 2014 11:37:18 PM CEST vzkernel-2.6.32-042stab088.4.x86_64           Mon 26 Apr 2014 09:01:00 AM CEST nss-softokn-freebl-3.14.3-10.el6_5.x86_64     Sat 26 Apr 2014 09:01:00 AM CEST nss-softokn-3.14.3-10.el6_5.x86_64            Sat 26 Apr 2014 09:01:00 AM CEST bridge-utils-1.2-10.el6.x86_64                Tue 15 Apr 2014 02:22:41 PM CEST openssl-1.0.1e-16.el6_5.7.x86_64              Wed 09 Apr 2014 10:14:03 AM CEST ...   lsmod gives me the following:  $ lsmod | grep ip iptable_nat             6302  0 nf_nat                 23213  2 iptable_nat,vzrst nf_conntrack_ipv4       9946  3 iptable_nat,nf_nat nf_defrag_ipv4          1531  1 nf_conntrack_ipv4 nf_conntrack           80281  5 iptable_nat,vzrst,nf_nat,nf_conntrack_ipv4,vzcpt ip6t_REJECT             4711  0 ip6table_mangle         3669  0 ip6table_filter         3033  0 ip6_tables             18988  2 ip6table_mangle,ip6table_filter iptable_mangle          3493  0 iptable_filter          2937  0 xt_multiport            2716  0 ipt_REJECT              2399  0 ip_tables              18119  3 iptable_nat,iptable_mangle,iptable_filter ipv6                  322519  35 vzrst,ip6t_REJECT,ip6table_mangle   Running modprobe gives the following error:  $ modprobe /lib/modules/2.6.32-042stab088.4/kernel/net/ipv4/netfilter/iptable_nat.ko FATAL: Module /lib/modules/2.6.32_042stab088.4/kernel/net/ipv4/netfilter/iptable_nat.ko not found.   But the file does exist:  $ ll /lib/modules/2.6.32-042stab088.4/kernel/net/ipv4/netfilter/iptable_nat.ko -rwxr--r-- 1 root root 16K Apr  3 16:20 /lib/modules/2.6.32-042stab088.4/kernel/net/ipv4/netfilter/iptable_nat.ko*   Any ideas?
61404
I have read  and tried to follow the selected answer's advice. I have also read  but the second question I believe is unrelated to my issue. (But I'm not sure.)  When Ubuntu (Or possibly just Unity) crashes everything stops working. I have to completely turn the machine on and off. I cannot do the SysReq soft-reboot because I have not been able to find a key-equivalent for my keyboard/laptop model.   I can provide logs upon request, but to be honest I don't know which ones would be of use, or how much of those logs would be of use.   My computer is a Dell Inspiron 11 3000 series. I believe  is my model, assumed after cross-checking system specs with the listing I linked. The PC is running the newest LTS release of Ubuntu 14.04 Trusty Tahr.   At first I believed this to be a problem that only occurred during video playback, but while the system doesn't crash near as often when not playing back video, it still will occasionally.   I'm a software engineer, so I HAVE to have a reliable computer. I've recently decided to open-source all of my company's non-client-specific code, and changed all of my servers to Debian, and also installed Ubuntu on my main workstation. The company now uses 100% open source software on all of its machines. However, I will be forced to return to Windows if I can't resolve this issue, and I would really be bummed about that.    What are the steps, in plain language for an Ubuntu novice, of diagnosing crashes on Ubuntu? Once discovered, what resources can I use to fix these issues? And finally, is there a chance that I will be forced to use proprietary software in order to correct these issues?    Thanks.
50632
Ubuntu can't be installed on my system because of what the title says. This is because support Intel HD Graphics 530 was only just added in Linux kernel 4.3 and all versions of Ubuntu only have kernel versions up to 4.2 as of 15.10. My computer's processor is the new Intel Skylake 6600K if you need to know, everything else is generic. It has a UEFI BIOS motherboard. Help?
63990
Dell LAtitude E6430 with CPU Intel® Core™ i5-3210M, 64 bits, no longer boots after updating 14.04 LTS system to kernel 3.13.0-66. It hangs off after completion of the password. Back to the 3.13.0-64 kernel works, but still with a system error, pending since about the beginning of the year (beginning approximately for the kernel 3.13.0-40) and never corrected by subsequent upgrades. It seems that the system 14.04 LTS is going worse and worse on this computer. Is there a solution ?
7513
A few days ago my MacBook Pro slipped out of my hands and fell onto the tile floor. The outside got banged up quite a bit and the Touch Bar no longer lights up but still responds to touches sometimes but not all the time.   Anyway, since then it will randomly restart every once in a while with a kernel panic. I have the log posted below and wanted to know if anyone could tell me what is causing the panic?
18298
Yesterday I upgraded my Ubuntu Desktop from LTS 14.04 to LTS 16.04. I did it via Software Updater.  There were several errors during the upgrade (is there a place where these errors are listed in the system so I can post it here?). The last one of them was at the end, saying that the boot partition was full. Following a post, I deleted a few kernels which I thought were old.  Now when I do uname -r it tells me that the kernel version is 3.13.0-93-generic, but it should be 4.4 something right? Can it be that I deleted the correct kernel by mistake? If yes, how do I fix this?  But the command cat /etc/os-release shows:  NAME="Ubuntu" VERSION="16.04.1 LTS (Xenial Xerus)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 16.04.1 LTS" VERSION_ID="16.04" HOME_URL="http://www.ubuntu.com/" SUPPORT_URL="http://help.ubuntu.com/" BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/" UBUNTU_CODENAME=xenial   The system seems to think it is 16.04 but I have a feeling there are many other wrong things, I just don't know how to find these upgrade errors.  Is there an official ubuntu post upgrade script that checks if everything is ok?  I don't know if it adds anything, but two other errors that I remember were that the ubuntu software center did not work after the upgrade, I fixed following a post that said it had something to do with a language setting. The other error was that on boot it showed "Lvmetad is not active yet, using direct activation during sysinit" which I fixed by edditing the GRUB file.  Anyways, I just want to know if my system is ok and what is the meaning of this contradiction between the kernel and the system version (if 16.04 had the wrong kernel would it even boot?)  Thank you very much in advance for any help!!!  Edit: Here is what I have installed (output of dpkg -l | grep linux-image):  linux-image-3.11.0-19-generic                                                                linux-image-3.11.0-20-generic                                                                linux-image-3.11.0-22-generic                                                               linux-image-3.13.0-93-generic                                                               linux-image-extra-3.11.0-19-generic                                                           linux-image-extra-3.11.0-20-generic                                                           linux-image-extra-3.11.0-22-generic                                                        linux-image-extra-3.13.0-93-generic
54836
Under certain conditions, the Linux kernel may become tainted. For example, loading a proprietary video driver into the kernel taints the kernel. This condition may be visible in system logs, kernel error messages (oops and panics), and through tools such as lsmod, and remains until the system is rebooted.  What does this mean? Does it affect my ability to use the system, and how might it affect my support options?
52525
I had several friends ask me to update their Ubuntu to a newer kernel without changing the version of Ubuntu. So for example, staying in 10.04 with the 3.3 Kernel version.  When having an older or present Ubuntu version, many users want to apply the newer stable/unstable kernel version to the Ubuntu version they are using thinking that it is similar to upgrading a program. So what I am looking for, are some simple answers to explain the dangers (that are pretty much bigger than the advantages) of forcing a newer kernel version in a Ubuntu release that was not meant for it.  What can I tell them or explain to them of why they should NOT update to a newer/older kernel when having an Ubuntu version that was not made for that kernel version.
17148
I'm attempting to install Ubuntu 14.04.1 (the only version I have handy) onto my old Compaq Presario R3000 (this Ubuntu was recommended for this computer). The installation has stalled at about 60% and hasn't moved in an hour.  The message at the bottom says: Configuring bcmwl-kernal-source (i386).  I have no experience with Ubuntu (or with Linux, for that matter), coming from a strictly-Windows background). Can anyone offer some advice?
85149
I have the below kernels installed on my machine:  [rajiviyer@rajiv-pc dnf]$ sudo dnf list installed kernel Installed Packages kernel.x86_64                     4.16.3-301.fc28                      @anaconda kernel.x86_64                     4.18.14-200.fc28                     @updates  [rajiviyer@rajiv-pc dnf]$    New Kernel: 4.18.14-200.fc28  Old Kernel: 4.16.3-301.fc28  Below is the list of dependencies for the Old Kernel: 4.16.3-301.fc28  [rajiviyer@rajiv-pc dnf]$ sudo dnf list installed kernel*4.16.3-301.fc28.x86_64 Installed Packages kernel.x86_64                            4.16.3-301.fc28               @anaconda kernel-core.x86_64                       4.16.3-301.fc28               @anaconda kernel-modules.x86_64                    4.16.3-301.fc28               @anaconda kernel-modules-extra.x86_64              4.16.3-301.fc28               @anaconda [rajiviyer@rajiv-pc dnf]$    I got a reference article which shows the steps to remove old kernel:   Kindly advice if I should proceed with the steps laid down in the article.  OR  Any GUI tool to remove kernel?  Post kernel removal what are post tasks need to be carried out? For e.g Updating GRUB