Thanks for this report, and sorry for the slow response. Since you say the problem also occurs with Synaptic, this is probably a problem in apt, not in USC. Moving there.
If you still experience the problem, you could also help get this bug fixed by providing the error message: 1. close Ubuntu Software Center (or Synaptic), if it's open already 2. enter the command "software-center" (or "sudo synaptic") in a Terminal window 3. trigger the error 4. copy any error output from the Terminal window, and paste it into this bug report. ** Package changed: software-center (Ubuntu) => apt (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/682879 Title: Installation of software from the software centre often stalls halfway, and never continues. It also prevents the pc from shutting down (hours later) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/682879/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs