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After installing several updates and restarting Ubuntu 16.04, I was greeted with a strange looking login screen. When I try to login the same screen temporarily disappears and then reappears.

~/.xsession-errors shows:

upstart: Failed to spawn unity-panel-service-lockscreen pre-start process: unable to execute: No such file or directory

...

upstart: unity-panel-service main process (9326) killed ky HUP signal

and some other errors.

I can't find anything on Google about this error. Any suggestions?

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