Hi Filip,
Looks like you've got a typical conflict between the nvidia proprietary
driver and your kvm kernel module in your local configuration. Getting
this working can be a bit tricky and so I'd suggest soliciting help from
community support channels (http://www.ubuntu.com/support/community).
I
** Description changed:
Hi!
The issue:
I have/had an 64 bit version of Ubuntu 18.04.3 LTS (In GRUB: Linux
4.15.0-51-generic) and I installed kvm well as on the
https://help.ubuntu.com/community/KVM/Installation page written.
(kvm-ok and virsh list --all not show any problem too)