Found this while googling for the same issue. Will continue researching and update here if I find anything.
Here is the output I get: root@arc:~# do-release-upgrade Checking for a new Ubuntu release Get:1 Upgrade tool signature [198 B] Get:2 Upgrade tool [1,221 kB] Fetched 1,221 kB in 0s (0 B/s) authenticate 'vivid.tar.gz' against 'vivid.tar.gz.gpg' extracting 'vivid.tar.gz' Reading cache Checking package manager Cannot upgrade An upgrade from 'trusty' to 'vivid' is not supported with this tool. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1502800 Title: Upgrade from 14.04 LTS to 15.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1502800/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
