KVM is not installed on this machine (/dev/kvm is missing)

Question

I'm using Ubuntu 14.04. I recently installed Android Studio, but whenever I try to run a Hello World app, I get this error:

/home/praveen/Android/Sdk/tools/emulator -avd Nexus_6_API_21 -netspeed full -netdelay none
emulator: ERROR: x86 emulation currently requires hardware acceleration!
Please ensure KVM is properly installed and usable.
CPU acceleration status: KVM is not installed on this machine (/dev/kvm is missing).

maybe u have a 32 bit system ,, try upgrading it n then try ... android emulator also requires 4gb ram and higher . — yunus, Nov 18 '17 at 19:20

score 80 · Answer 1 · answered Dec 24 '14 at 08:56

80

Use the below command to check whether the KVM is installed in the machine or not,

kvm-ok

Output:

INFO: /dev/kvm exists
KVM acceleration can be used

Output like the below means,

INFO: Your CPU does not support KVM extensions
KVM acceleration can NOT be used

In this scenario need to install KVM using the below command,

sudo apt-get install qemu-kvm libvirt-bin ubuntu-vm-builder bridge-utils

Hope this helps.

answered Dec 24 '14 at 08:56

BDRSuite

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praveen@praveen-Lenovo-B590:~$ kvm-ok INFO: /dev/kvm does not exist HINT: sudo modprobe kvm_intel INFO: For more detailed results, you should run this as root HINT: sudo /usr/sbin/kvm-ok praveen@praveen-Lenovo-B590:~$ – praveen kumar Dec 24 '14 at 14:37
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`sudo apt-get install cpu-checker` for `kvm-ok`. – Wtower Feb 03 '16 at 10:24
@vembutech after executing command `kvm-ok ` I got an output that- "does not exist". So, I've installed it using the above mentioned command. It has been downloaded. Last line is `Processing triggers for ureadahead (0.100.0-16) ...` now I run the `kvm-ok ` command again. But again it says "does not exist" – Prabs Feb 08 '16 at 12:24
libvirt-bin is no longer used: https://askubuntu.com/questions/1089753/e-package-libvirt-bin-has-no-installation-candidate – poleguy Jun 20 '22 at 14:07

score 43 · Accepted Answer · answered Dec 24 '14 at 15:37

43

Either your CPU does not support virtualization, or it is disabled in the bios. Go into your bios and see if you can find a setting to enable it.

answered Dec 24 '14 at 15:37

psusi

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I am having this error on a Mac. Solution isn't applicable to Macs because they have no BIOS. What to do then? – IgorGanapolsky Jul 06 '17 at 13:21
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Go into your bios and see if you can find a setting to enable it - What is the process to do that ???? – B.shruti Aug 01 '17 at 05:11
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How to go into bios? – Riddhi Shah May 09 '18 at 09:11
@Riddhi, it depends on your computer. Usually hit DEL or F12 or F1 when it says. – psusi May 09 '18 at 16:04

score 18 · Answer 3 · edited Feb 11 '15 at 12:37

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HP-EliteBook-820-G1:/opt/android-studio/bin$ sudo /usr/sbin/kvm-ok
INFO: /dev/kvm does not exist
HINT:   sudo modprobe kvm_intel
INFO: Your CPU supports KVM extensions
INFO: KVM (vmx) is disabled by your BIOS
HINT: Enter your BIOS setup and enable Virtualization Technology (VT),
      and then hard poweroff/poweron your system
KVM acceleration can NOT be used

Affter bios setting, I used the following command

sudo modprobe kvm_intel

Now is ok

edited Feb 11 '15 at 12:37

chaos

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answered Feb 11 '15 at 11:47

Allal

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this solution worked perfect for my Ubuntu 14.0 – Tarun Jul 04 '16 at 10:02
this fixed it for me on Ubuntu 12.04 64Bit – SpamBot Aug 26 '16 at 14:58

score 11 · Answer 4 · answered Jun 27 '15 at 23:46

11

Worked on Ubuntu 15.04, Intel's CPU

sudo apt-get install qemu-kvm
Enable Virtualization Technology in BIOS
sudo kvm-ok

answered Jun 27 '15 at 23:46

asilchenko

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score 6 · Answer 5 · answered May 25 '18 at 05:25

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I had tried the command,

sudo apt-get install qemu-kvm libvirt-bin ubuntu-vm-builder bridge-utils

but unfortunately it didn't work. Then I changed owner (rohanverma is user in my case) by using,

sudo chown rohanverma:rohanverma -R /dev/kvm

which worked for me.

answered May 25 '18 at 05:25

Rohan Kumar

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This worked for me on Ubuntu 18. First had to enable on BIOS and then use `chown` as there was `no permissions` – HalfMens Sep 04 '20 at 20:23

score 3 · Answer 6 · edited Jul 27 '16 at 04:01

3

I saw the same error. But I'm running Ubuntu on the VMware. Ubuntu is installed on the VMware. So the steps to resolve the problem is different from pure ubuntu machine. The complains went away with the following steps:

sudo apt install cpu-checker
In VMware, go setting->Processors->Virtualization Engine, check "Virtualize Intel VT-x/EPT or AMD-V/RVI.
sudo kvm-ok

edited Jul 27 '16 at 04:01

techraf

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answered Jul 26 '16 at 14:40

Hong

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score 1 · Answer 7 · edited Jan 28 '17 at 02:07

1

Close any other hypervisors before starting Android Studio. I received the same error message when I tried to run an Android Virtual Device and had a Virtual Box VM running at the same time.

edited Jan 28 '17 at 02:07

wjandrea

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answered Jan 27 '17 at 22:53

drkpeezy

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This does not really answer the question. If you have a different question, you can ask it by clicking [Ask Question](http://askubuntu.com/questions/ask). You can also [add a bounty](http://askubuntu.com/help/privileges/set-bounties) to draw more attention to this question once you have enough [reputation](http://askubuntu.com/help/whats-reputation). - [From Review](/review/low-quality-posts/671553) – earthmeLon Jan 28 '17 at 00:37
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@earthmeLon I fixed it. – wjandrea Jan 28 '17 at 02:07

KVM is not installed on this machine (/dev/kvm is missing)

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