I recently decided to use Virtualbox to run Ubuntu, but I get the message     this kernel required an X86-64 CPU, but only detected a i686 CPU   I've already enabled virtualization in BIOS, but that doesn't seem to work. Many other solutions suggest that I should download the 32-bit version, and not the 64-bit. I'm not sure about that though, since my computer clearly says "64-bit operating system" under systems. But I might just be mistaken.
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I was trying to install Ubuntu 12.04 in VirtualBox 4.2.12r84980. I see    this kernel requires an x86-64 CPU, but only detects an i686 CPU, unable to boot   But I am using a 64 bit Windows 8, and trying same .iso for trying Ubuntu. Then what is the problem?
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Kernel driver not installed (rc=-1908)      The VirtualBox Linux kernel driver (vboxdrv) is either not loaded or   there is a permission problem with /dev/vboxdrv. Please reinstall the   kernel module by executing      '/etc/init.d/vboxdrv setup'      as root. If it is available in your distribution, you should install   the DKMS package first. This package keeps track of Linux kernel   changes and recompiles the vboxdrv kernel module if necessary.   This is a familiar message to everyone that uses Virtual Box. This "bug" has been popping up every few months at least since 11.10. I got it today for the first time on 14.04 and unfortunately the  of re-installing virtualbox-dkms is not having any effect:  sudo apt-get install linux-headers-generic build-essential dkms sudo apt-get remove virtualbox-dkms sudo apt-get install virtualbox-dkms   What could be the reason for this old fix to fail?  Update: In the comments user bain makes reference to an old thread that apparently reports to the same problem. While the error message is similar, on Ubuntu 14.04 this issue seems to have a different nature, unrelated to the virtualbox-dkms package. For instance, on Ubuntu 14.04 the virtualbox package is up to date:  $ sudo apt-cache policy virtualbox virtualbox:   Installed: 4.3.10-dfsg-1   Candidate: 4.3.10-dfsg-1   Version table:  *** 4.3.10-dfsg-1 0         500 http://de.archive.ubuntu.com/ubuntu/ trusty/multiverse amd64 Packages         100 /var/lib/dpkg/status
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My Windows XP installation has become unusable for some unknown reason. Since Microsoft is going to end support in a few days anyway, I decided to install Linux Mint.  For optimal hardware utilization, I want to use a 64-bit system if possible. However, since XP isn't working it's not possible to .  Therefore, I want to use the BIOS to find it out.  What information in the BIOS should I use to determine whether or not my I can install a 64-bit operating system?
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i know this question has been asked a lot on superuser, but i am stuck as i have checked with different applications, windows system information, vmware processor x64 processor utility, cpu-z, securable, registry entry..and i am getting different results. i have windows 8 32-bit.  windows system information  System Type X86-based PC  System Properties    vmware guest64check    cpu-z    Securable    Why am i getting different results in windows system info and vmware processor utility, and what exaclty is my machine type? Will it be able to run windows 8 64-bit?  Thanks.
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Why is it that:   a 32-bit OS, when installed on a 64-bit CPU, can run old 16-bit applications,  but if you install a 64-bit OS it can't run those applications directly and need some sort of emulation (that doesn't always work perfectly)?     To be more specific, I have an 64-bit processor (Intel Core 2 Duo). When I had Windows XP and Windows 7 (both 32-bit) installed, they could run old DOS and 616-bit Windows applications.   Now I have installed the 64-bit edition of Windows 7. Why can't it run those same applications anymore?
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I have recently been trying to install VirtualBox, when this message came up:  No bootable medium found!   Can somebody please tell me what went wrong?
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Is is possible to run a 64 OS in a virtual environment host that is 32 bit. Say for example, I am running Windows XP 32 bit. Would it be possible for me to run a 64bit OS using VirtualBox or VMWare. My processor is a 64bit processor with VT enabled.
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I am planning to rent a VPS service with following basic specification:   512mb of RAM 1 CPU 20gb HDD (4gb of it is swap) Ubuntu 10.10 server   I am able to choose between a 32 bit or 64 bit install of Ubuntu server as the operating system.   My question is would it be better to chose a 32 bit operating system since I will have only 512mb of RAM, rather than using a 64 bit operating system and dealing with the additional overheads?  edit:  I have installed Ubuntu server 10.10 32 bit and 64 bit on VirtualBox. After a minimalistic installation with only ssh server, the 32 bit installation consumes 63mb of RAM when first boot up and 64 bit consumes 85mb of RAM.  After installing and running  daemon, 32 bit consumes 99mb of RAM when first boot up and 64 bit consumes 128mb.
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I get this message while trying to install Ubuntu 12.04 as a guest in VirutalBox 4.1.18, on an Ubuntu 10.04 host.         This kernel requires the following feature not present on the CPU: pae   Some host specs:     The host's kernel is: Linux 2.6.32-41-generic-pae GNU/Linux   lscpu (host): Architecture: i686, CPU op-mode(s): 32-bit, 64-bit   grep --color=always -i PAE /proc/cpuinfo   does show pae in its output.   The 12.04 iso used is: ubuntu-12.04.0-desktop-i386.iso      As a comparison/check, I downloaded and installed Linux Mint 13 Cinnamon to the same host on the exact same VM (I just changed the .iso image). It worked fine. Its iso is: linuxmint-13-cinnamon-dvd-32bit.iso   It seems (to me) that I have pae.. what is going on here?   Update: I had assumed that Linux Mint also required pae (being Ubuntu based), but I've just run;   grep --color=always -i PAE /proc/cpuinfo   in the Mint VM.   It showed no output.   So it seems the issue may lie with VirtualBox.   If that is the case, how can I get Virtualbox into pae mode?
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My host is x64 bits Windows 8.1.  I downloaded the latest Virtual Box (4.3) and I'm trying to create a VM with a 64 bits Ubuntu OS (ubuntu-12.04.3-desktop-amd64).  When I go to New VM wizard, it doesn't give me option to select "Ubuntu (x64)" as I have seen in other people's screenshots, only just "Ubuntu". As a result, the ISO can't boot. I tried in another PC and Virtual Box gives the x64 variants to most listed OS...  Control Panel shows x64 OS, x64 processor. My host laptop is a Sony Vaio VPCZ22UGX/N, Intel® Core™ i7-2640M processor. CPUz shows Vx-t is available on my processor, of course.  Here is what I tried so far:   I enabled IO APIC as required in the docs. I have virtualization enabled in the BIOS. It works fine in VMware. Check that Hyper-V is not running or even installed on my Windows. Same for VMware. I also tried running the command:  VBoxManage modifyvm [vmname] --longmode on    for that VM, but no change.. I think the issue is really that I can't select x64 variant of the Ubuntu OS for that VM. Other people seem to indicate that's a requirement, but I don't get that option for some reason.  I spent a lot of time and can't find what's wrong... Anyone knows what could be missing here?  Thank you very much!!  Eduardo
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Environment:   Host OS: Win7 Pro 64bit Guest OS: WinXP 32bit VirtualBox version: 4.1.4r74291 Processor: Intel Core i7 2630QM with virtualization enabled   The Problem:  I need the guest system to use multiple cores. I have enabled the following options in VirtualBox:    IO APIC (motherboard tab) PAE/NX (processor tab) VT-x/AMD-V (acceleration) nested paging (acceleration)   All other options on the System submenu are switched of. The 'processors' slider is set to 8.  The problem is that the guest system runs correctly, but only one processor/core is visible.
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I received the updates through normal Software Updater, 10-Jan-2018. After this VirtualBox would not start any VM, complaining about dkms and asking to make modprobe vboxdrv. Following the advice I reinstalled virtualbox-dkms with:  sudo apt-get --reinstall install virtualbox-dkms   After this and a reboot I tried to start a VM which freezed the whole machine and a hard reboot was necessary.  Is there a way to make VirtualBox work with the latest kernels?  EDIT:  As suggested by N0rbert, the command:  apt-cache policy `dpkg -S VirtualBox | head -n1 | sed -e 's/://g' | awk '{print $1}'`  gives:   virtualbox-qt:   Installed: 5.0.40-dfsg-0ubuntu1.16.04.2   Candidate: 5.0.40-dfsg-0ubuntu1.16.04.2   Version table:  *** 5.0.40-dfsg-0ubuntu1.16.04.2 500         500 http://fr.archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 Packages         100 /var/lib/dpkg/status      5.0.18-dfsg-2build1 500         500 http://fr.archive.ubuntu.com/ubuntu xenial/multiverse amd64 Packages   EDIT (on 29-Mar-2018): Issue is resolved for me, with the Ubuntu Ubdate from today. I have seen that it had some virtualbox-updates, therefore I tried to boot with the most recent kernel again. Then I had to run  sudo apt-get --reinstall install virtualbox-dkms  And after this my virtual machines in VirtualBox started working without crashing the whole computer. Finally!
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What is the difference between standard i386 download and the amd64 download of Ubuntu 11.04? I am currently running the i386 on an amd machine, would my system work better with the amd64 download instead? (my machine was running Windows 7 64bit, but I neglected to look at that prior to installing Ubuntu).
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I have already dual systems : Windows 7 and Ubuntu installed on my laptop. The Windows 7 had been installed when I bought this laptop, and I don't have a CD.  I just installed VitrualBox under Ubuntu, hoping that I could install another Windows in this virtual machine, so that I could run some applications of Windows even under Ubuntu.  But it seems that I need a CD or ISO of Windows to boot inside this virtual machine. Otherwise, there is an error: FATAL: No bootable medium found! System halted. My question is where I could find a CD or ISO?  At the moment, I am downloading ISO from this , but do not know if it will work. By the way, I am not sure if I should pick the 32-bit or 64-bit? As my CPU is 64-bit but my Ubuntu is i386.  Could anyone help? Thank you very much.
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I recently installed Oracle Virtualbox from their website on Xubuntu 15.04 64-bit. Specifically, Virtualbox 5.0.4. However, when I try to install a virtual machine, it only gives me the option to install a 32-bit OS (as seen below). Is there a way to allow 64-bit OSes?
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I need to learn about , and I only have a laptop with Fedora 14/VirtualBox on it. Is there any chance that I could run an AIX guest in my VirtualBox?   My laptop has an Intel(R) Core(TM)2 Duo CPU T7100 @ 1.80GHz, and I read that it only runs on RISC architecture. So there's no way I can run it on my laptop?
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I have 5 computer systems in our small office. From my basic understanding of Virtualization technology, I think I can virtualize the 5 systems into one big virtual system. I wish to confirm this.  So, for example, if I have 3 GB of RAM and 2 cores on each system, my question is:-   Can I make one big virtual system which will have 15 GB of RAM (3 * 5 sysems) and 10 cores? If the answer to the above question is yes, which is the best free and Opensource software/hypervisor to do this? Can Oracle VirtualBox be a good candidate?   I am a beginner in Virtualization technology so please pardon if the questions are too simplistic/nonsense.