Well, the proximate reason why it's still offering you updates is that aptitude didn't upgrade some things (the bits it said had been "kept back")--aptitude can be a bit picky about some upgrades. There will be some way of forcing it to install these using aptitude or apt-get, if you particularly need them.
The ultimate reason for the problem is presumably that update-manager is hanging somewhere--it may be failing to connect to the server, for example (is there anything odd about your internet connection, such as a proxy server?). I've marked the bug as affecting update-manager. ** Changed in: update-manager (Ubuntu) Sourcepackagename: None => update-manager -- Update 2.6.24.18.20 fails https://bugs.launchpad.net/bugs/237662 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