virsh # define /etc/libvirt/qemu/bt01.xml
Domain bt01 defined from /etc/libvirt/qemu/bt01.xml

virsh # start bt01
error: Failed to start domain bt01
error: internal error process exited while connecting to monitor: qemu: could not open disk image /root/ubuntu-kvm/tmppVRCGg.qcow2: Permission denied


virsh #