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Indeed, thanks again @BrianH2 - your steps totally worked for me. Going from Ubuntu 14.04 to 16.04 under Parallels 11.2.2 (32651), running in...
Alright - well, creating a new user account, and everything seems OK. So.... some issue w/ migration from 12.0.4 to 12.10 to 13.0.4. I guess...
Yeah, I've got pretty much the same situation.