Hi @unix_lover
I had the same issue before. Look at this thread Restarting -> stop job for user running!
I did the Magic SysRq key
. At least it helped to shut down instantly the proper way.
Though I do not really know what caused it, but I rarely encounters it after that and if it did the Magic SysRq key
helps.
I hope this helps. Please let me know how it goes with you.
Thank you.