I had this problem on all my home computers 1pc, 1laptop and 1netbook.
I realized that xinit works ok but executing any gtk programm throws undefined
symbol g_malloc_n and something about libgdk-x11-2.....
So googling I found that there was obsolete libraries on /usr/local/lib that
shadows good libraries in /usr/lib
this gives you which: ldd libgdk-x11-2.0.so.0 | grep local
Moving that to another place solved the problem.
I don't know what package caused this problem but I think is repositories bug
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Checking Battery State [OK] X Crashing
https://bugs.launchpad.net/bugs/301601
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