I was having the same problem (i.e. hanging Update Manager). I updated with synaptic and then, after having read this thread, did...
apt-get -f install apt-get clean apt-get update apt-get upgrade All ran cleanly without error. Interestingly, apt-get upgrade found the following... xserver-xorg-core I also had the newest version of libgksu2-0 -- Update Manager hangs in 8.04 LTS https://bugs.launchpad.net/bugs/239358 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
