Everything is back to normal after deleting the following file (found that tip on a newsgroup) sudo rm /etc/X11/Xsession.d/00xserver-xgl_start-server
So it seems that xgl, or at least the upgrade of it is to blame. -- [gutsy] xserver sluggish after upgrade https://bugs.launchpad.net/bugs/136982 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs