Been trying to set up Whonix with KVM, but hit a bug that I was not able to resolve with searching the error. When starting either Whonix-Gateway or Whonix-Workstation with default XML and KVM (with graphical virt-manager) it gives the error:
After some searching this error I have tried installing spice-client (with apt-get install spice-client) and it turned out it was indeed not installed during the KVM install (should it?). However this did not resolve this error.
After that I tried using another virtualization platform, VNC, by changing the Display type from Spice to VNC under "Show virtual hardware details". This worked, Whonix with VNC gives a correct graphical display.
How could I resolve the Spice error? Or is using VNC instead of Spice a viable alternative and what security consequences will it have? Are those easy to migrate?