Thanks so much guys, your comments help me a lot. Will follow that guide next time it's happening.
By the way, I removed my old NVIDIA driver and installed a much newer one. Looks like my system is behaving much better now. There were no hints at all that my NVIDIA driver was outdated. You should add some notification in the OS to tell me to update the graphic drivers! -- You received this bug notification because you are a member of DX Packages, which is subscribed to unity in Ubuntu. Matching subscriptions: dx-packages https://bugs.launchpad.net/bugs/1345296 Title: Unable to load entry point in libxpathselect Status in Unity: In Progress Status in “unity” package in Ubuntu: Triaged Bug description: Hello When restarting unity I get this error message and it looks like it's related to lightdm. At the moment I cannot select my windows at all and can only use the command line :( ERROR 2014-07-20 13:19:20 unity.debug.interface DebugDBusInterface.cpp:216 Unable to load entry point in libxpathselect: libxpathselect.so.1.4: cannot open shared object file: No such file or directory I did a very recent apt-get update && apt-get upgrade with the latest Ubuntu 14 kernel/ To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/1345296/+subscriptions -- Mailing list: https://launchpad.net/~dx-packages Post to : dx-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~dx-packages More help : https://help.launchpad.net/ListHelp