This occurs in Natty Narwhal Alpha 1. I was installing Chromium when Apport told me Software Center has crashed and that the bug is already known (so it pointed me here). The odd thing, though, is that the Software Center window didn't go away...
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/507836 Title: [master] software-center crashed with DatabaseModifiedError in _database_gen_postlist_iter() -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs