I don't know if this is the same bug or not, but I have the same result
(complete freeze, black screen, Ctrl-Alt-F1 doesn't work) when the Guest
session /ends/. Or if I switch users, that's fine, but when I log out to
return to the previous session, then it freezes.

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Black screen when switching users
https://bugs.launchpad.net/bugs/266911
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