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I am on Ubuntu 18.04 LTS and I am trying to set up Android Studio for the first time. When I run my simple "Hello World" app, it gives me a pop-up that says

KVM is required to run this AVD.
Unknown Error

Please file a bug against Android Studio

popup

But when I run simply kvm-ok it outputs:

INFO: /dev/kvm exists
KVM acceleration can be used
Zanna
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Nomi Shaw
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5 Answers5

35

Starting with Ubuntu 18.04 and Linux Mint Tara you need to install qemu-kvm

sudo apt install qemu-kvm

Check the ownership of /dev/kvm

ls -al /dev/kvm

Check which users are in the kvm group

grep kvm /etc/group

Output from the above command

kvm:x:some_number:

If there is nothing rightwards of the final :, there are no users in the kvm group.

To add the current user to the kvm group

sudo adduser $USER kvm

which adds the user to the group, and check once again with grep kvm /etc/group.

A restart may be required for the permissions to take effect.

Official answer on StackOverflow

Kulfy
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G. Spyridakis
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  • after adduser run this too...sudo chown $USER /dev/kvm – vamsi Apr 22 '20 at 06:24
  • Thanks @rogoro. Running chown solved problem without restart. – csonuryilmaz May 06 '20 at 19:16
  • Installing qemu-kvm is really not necessary for Android Studio, one can simply create the kvm (system) group and install a udev permission override to enable user access. See https://stackoverflow.com/a/61984745/624066 – MestreLion Sep 23 '20 at 14:58
  • @vamsi That does not really make sense. Do one or the other. If you add $USER to the kvm group that should be enough. Of course you have to logout/login. You have group rights then. Running that chown command makes $USER the owner of that device. That is not recommended as this is a strong change in system defaults. – Gerd Jan 26 '21 at 19:46
1

Change sdk emulator folder permission. This is worked for me. 

chmod 777 -R {sdk folder}/emulator

https://stackoverflow.com/questions/44635879/kvm-is-required-to-run-this-avd-unknown-error-please-file-a-bug-against-androi

Tuychiev Toir
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0

To run KVM, you need a processor that supports hardware virtualization.

To see if your processor supports hardware virtualization, you can review the output from this command:

egrep -c '(vmx|svm)' /proc/cpuinfo

  • If 0 it means that your CPU doesn't support hardware virtualization.

  • If 1 or more it does - but you still need to make sure that virtualization is enabled in the BIOS.

Installation of KVM

Cosmic (18.10) or later

sudo apt-get install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils

You need to ensure that your username is added to the group libvirtd, and kvm:

sudo adduser `id -un` libvirt
sudo adduser `id -un` kvm

Verify Installation

Run kvm-ok on the command line.

$ kvm-ok
INFO: /dev/kvm exists
KVM acceleration can be used

Logout or restart for changes to take effect.

Sources:

https://developer.android.com/studio/run/emulator-acceleration#accel-check https://help.ubuntu.com/community/KVM/Installation

Gayan Weerakutti
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-1

I usually run

sudo chown username -R /dev/kvm

but this is only good for a while. Looking for a better solution.

There is also another command:

sudo adduser username kvm
ADNow
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-1

Login as a root user sudo su goto the studio installation dir withcd ${path_of _installation_dir}/android-studio/bin and relaunch the sdk with ./studio.sh. Then try relaunching your avd

Rohit
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  • Never log in as the root user! There's nothing you could do as root, that you can't do with sudo. And if you only need the permissions of a specific group, sg if you belong to it, sudo -g if you don't — sg kvm <path-to-your-android-studio>/bin/studio.sh in this case, given the kvm group has read+write permission on /dev/kvm. – antichris Sep 06 '19 at 09:03