[Bug 1609796] Re: cant upgrade EOL 15.04

[Brian Murray]

As an example looking at the Ubuntu 18.04 dist-upgrader tarball it is
possible to upgrade from Ubuntu 16.04 or Ubuntu 17.10 to Ubuntu 18.04.
It should be fairly simple to add support to upgrade previous EOL
releases (e.g. 17.04) to Ubuntu 18.04 and that would be a good service
to provide.

** Tags removed: rls-y-incoming
** Tags added: rls-bb-incoming rls-ee-incoming

** Summary changed:

- cant upgrade EOL 15.04
+ can't upgrade from LTS-2 or LTS-3 to LTS

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https://bugs.launchpad.net/bugs/1609796

Title:
  can't upgrade from LTS-2 or LTS-3 to LTS

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged

Bug description:
  A user in #ubuntu complained about no beeing able to upgrade his EOL
  15.04 (cloud) server install, so i made a 15.04 server install in vbox
  to test this scenario, and he is right:

  Running "sudo do-release-upgrade" results in: 
  "An upgrade from 'vivid' to 'xenial' is not supported with this tool."

  An EOL Upgrade with changing the sources.list to use the old-releases
  doesnt work since vivid is not moved to the old-releases yet: http
  ://old-releases.ubuntu.com/ubuntu/dists/ .

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