Public bug reported: As far as I can see Ubuntu only supports 2 release upgrade paths[1]:
1. ${release} upgrade to ${next-release} (e.g. for 14.04 -> 15.10, you'll have to 14.04 -> 14.10 -> 15.04 -> 15.10, 3 upgrades in a row) 2. ${lts-release} upgrade to ${next-lts-release} (e.g. for 12.04 -> 14.04, you can do a direct upgrade) However currently on a ubuntu 14.04 if user chooses to "show any new Ubuntu versions" Update Manager(and do-release-upgrade) will suggest to directly upgrade to Ubuntu 15.10, this upgrade path has been verified[2] to cause entire system hang during the upgrade process and even if you do a hard reboot you'll end in a console-only 15.10 environment. Update Manager/do-release-upgrade should instead follow the 14.04 -> 14.10 -> 15.04 -> 15.10 upgrade path, while using old- releases.ubuntu.com[3] software source during the interim EOL'd ubuntu release upgrade ## References ## [1]upgrade - Can I skip over releases when upgrading? - Ask Ubuntu http://askubuntu.com/questions/34430/can-i-skip-over-releases-when-upgrading [2]Ubuntu 14.04→15.10 upgrade path testing - YouTube https://www.youtube.com/watch?v=p6f78HLaHmQ [3]EOLUpgrades - Community Help Wiki https://help.ubuntu.com/community/EOLUpgrades ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1569324 Title: Update Manager shouldn't suggest 14.04 -> 15.10 unsupported upgrade path To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1569324/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs