I'm having the exact same issue. This is upgrading from a 14.04 LTS Server VM that I have for testing purposes. So it's not unique to the MATE version.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1550922 Title: dist-upgrade from Ubuntu Mate 14.04.4 LTS to 16.04 LTS (Beta1) fails To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1550922/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
