Try to disable AIGLX in your /etc/X11/xorg.conf file:
Option "AIGLX" "false"
** Changed in: xserver-xorg-video-openchrome (Ubuntu)
Status: Incomplete => Confirmed
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[CLE266] X.org crashes during Kubuntu login; VIA Unichrome driver
https://bugs.launchpad.net/bugs/576445
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