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Particularity in this case, run in a terminal: sudo apt-get update sudo apt-get upgrade and verify if the error still preset. if not, please report here the terminal output. ** Changed in: ubuntu Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1032136 Title: i am unable to update ubundu 12.04 using the update manager To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1032136/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs