error : virPidFileAcquirePath:422 : Failed to acquire pid file '/run/user/1000/libvirt/libvirtd.pid': Resource temporarily unavailable

Solution 1:

Check that libvirtd was running on your system using command

ps -ef | grep libvirtd

move your pid file using command

mv /var/run/libvirtd.pid /var/run/libvirtd.pid.old

stop libvirtd service using command

systemctl stop libvirtd.service

and start again using command

systemctl start libvirtd.service