It's also happening to me in 10.04. lavinog's comment of 2010-06-04 does the trick for me.
-- update-manager "Install Updates" button not functioning https://bugs.launchpad.net/bugs/392073 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
