I have a many errors and questions. Begin.
sudo apt-get install qxl-xorg-enhance
[sudo] password for w:
Reading package lists… Done
Building dependency tree
Reading state information… Done
E: Unable to locate package qxl-xorg-enhance
No package in Ubuntu 16.04.
virsh -c qemu:///system net-start default
error: Failed to start network default
error: Requested operation is not valid: network is already active
Cool, what to do?