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 own the file /dev/kvm using chown.
After the above steps the AVD should work as expected.