How to fix KVM permission denied error on Ubuntu 18.0413 Aug 2018
The error message also shows a hint on what could be wrong:
Grant current user access to /dev/kvm. A quick google search reveals that this is a common problem.
The easiest way to fix this would be to install qemu-kvm and then give appropriate permission to the current user.
Use the adduser command to add your user to the kvm group.
And then logout/login or restart your system.
After the above steps the AVD should work as expected.
Update: I have removed the very bad approach of running
sudo chown <username> /dev/kvm. Thank you to all the people who had pointed it out in the comments :)