Hmm. Unity hung on Ubuntu and I can't figure out how to kill it. I'd usually use

ps -aux | grep Unity

and then kill the listed process, but there are at least a dozen of them. Is there any other way to do this?

Wow! I think I found the offending process, but kill doesn't kill it! (It quietly does nothing.) Same story for killall and System Monitor.

Hard reboot incoming!

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You can try specifying the signal to send (man signal), e.g.,

kill -s KILL

Also, use the "f" option in ps to show processes as a tree to ID the parent process, e.g.,

ps axf

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