CurrentDmesg shows:

[12436.390414] Out of memory: kill process 29463 (mutter) score 157749 or a 
child
[12436.390430] Killed process 29463 (mutter) vsz:630996kB, anon-rss:13324kB, 
file-rss:16868kB

So mutter was killed because you ran out of memory. It looks like mutter is 
using a lot of RAM.
You seem to have 1GB of RAM and no swap space enabled. I suggest you first 
create some swap space. That should prevent the crash and give you time to find 
out what is using all your memory.

-- 
[i945gme] Moving pointer over Unity's launcher crashes X and causes Unity to 
reload
https://bugs.launchpad.net/bugs/629814
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