it seems that this was a problem associated with AMD catalyst Driver with linux kernel 3.13.0-34. purging the catalyst driver and updating the kernel to 3.13.0-35 has solved the problem for me.
** Changed in: ubuntu Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1366318 Title: Ubuntu booting halts at "Setting up X server socket directory" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1366318/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs