Happy to help! As I though, it seems to be a bad mirror with a bad package. Its not the official ubuntu one though. It may be one of the university ones you were using. Thanks for reporting this and feel free to do so again in the future. Closing bug.
** Changed in: software-center (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/731735 Title: software centre won't quit -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs