Comment 2 for bug 1549455

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MichaƂ Sawicz (saviq) wrote : Re: Unity 8/Mir doesn't load

When this happens you should actually be able to press Esc to recover the greeter. You can also press Ctrl+Alt+F1 and log in there, following by "sudo service lightdm restart", that will restart the display manager.

That said, can you please clear /var/log/lightdm and ~/.cache/upstart/, try logging in to the unity8 session and collect the logs from both directories and attach here?