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Just confirming the instructions that Alexander and @TimothyR6 posted are spot on. Thanks guys for the information here.
Upgraded from Ubuntu 15.04 -> 16.04 @BrianH2 directions worked for me, except for when the system finally rebooted and was coming up it failed...
Fixed! I restarted Unity and that worked for me. Press Ctrl-Alt-T and that will bring the terminal window up. This will restart it: dconf reset...
I was running Ubuntu 14.04 with all the latest updates. Parallels prompted me to update to the latest upgrade (10.2.1) 29006. I did that. Then...