Everytime I start virt-manager, the tool I use on an every-day basis, it asks for the root password. Because I use LVM for my VMs, I need to use system libvirt. Well, it’s pretty easy to get rid of this. All I need to do is to add myself to the “libvirt” group. Tested on Fedora.
Run this as the user who needs to be added. Do not run this in “root shell” otherwise you add “root” to the group which is not a terrible thing to do, except it will not work like you intented:
sudo usermod -a -G libvirt $(whoami)