Offhand this sounds like a "compiz crashed" bug, particularly if you're
finding the issue does not appear with lubuntu or other non-unity
ubuntu's. If this is true, then you should be able to launch a terminal
window via "<ctrl><alt> t" when the system is showing just the
background.
In any case, since this bug was filed originally against linux, it does
not have the X debugging info. Please reproduce the problem and then
run 'apport-collect 1076776'. You may need to ssh into the box while
the system is blank/lockedup/corrupted, so we can see the exact error
state.
If it is compiz crashing, your ~/.xsession-errors may have some more
relevant error message about why compiz crashed.
** Changed in: xserver-xorg-video-nouveau (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1076776
Title:
12.10: Default background after logon
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