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
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https://bugs.launchpad.net/bugs/1569324
Title:
Update Manager shouldn't suggest 14.04 -> 15.10 unsupported upgrade
path
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