+* be more specific what failed:
+ Unmounting file systems.
+ Not all file systems unmounted, 1 left.
+ Disabling swaps.
+ Detaching loop devices.
+ Detaching DM devices.
+ Cannot finalize remaining file systems and devices, trying to kill remaining processes.
+ Unmounting file systems.
+ Not all file systems unmounted, 1 left.
+ Cannot finalize remaining file systems and devices, giving up.