Use virt-manager without root password on Debian 9
After installing virt-manager on Debian 9 you’ll notice that every time you try to open it it will ask for your root password.
In order to avoid that you’ll just need to add your user to the libvirt group:
sudo usermod -aG libvirt $USERLogout and login again. Or run newgrp libvirt and you should be able to launch it from the terminal for this session. You can now open virt-manager without your root password.