Could you give some more information about the exact problem you ran into? Based of the title of this bug it sounds like compiz crashed and the core file isn't the size that was expected. This can happen if your system ran out of memory when writing the core dump. If that's the issue then this just happens sometimes and the bug should be invalid.
** Changed in: ubuntu-release-upgrader (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/1680287 Title: compiz-core invalid core dump BFD Warning tmp/apport_core_6ywix5b7 is truncated: expected core file size >= 112926 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1680287/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs