Just few days after reinstalling ubuntu (see How to unencrypt encrypted home directory?) I found my pc showing weird error messages in console (something about read/write access). I rebooted it, checked disk from under USBStick, it was ok, ran apt-get update, apt-get upgrade, rebooted and got it loading, but stopping with showing "The system is running in low graphics mode" bla bla.
When I switch to console (Ctrl+Shift+F1) I see that encrypted home is not mounted so I guess it just can't find graphic configs. I still can mount it with ecryptfs-mount-private and I hope if I manage to get home mounted automatically graphics will start. There are posts saying that there is an option defined at /etc/pam.d/, but how exactly it should be enabled? Can't find it.