The crash file itself isn't that informative as it did not get retraced. I think it's enough to know that there was a compiz crash and that it made interacting with the upgrade process hard.
** Changed in: ubuntu-release-upgrader (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1573952 Title: Graphical update from 15.10->16.04 failed with apparent window manager crash To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1573952/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs