On Mon, Jun 29, 2020 at 10:01:54PM +0200, Marius Bakke wrote:
> guix-install.sh should add the build users to the 'kvm' group if present
> so that commands that require use of KVM can succeed.

Here is a patch (untested) that makes sure a 'kvm' group exists and adds
it to the guixbuilders' groups.