[Bug 1692092] Re: not possible to upgrade from Xenial and jump over an unsupported release

[Steve Langasek]

Hello Brian, or anyone else affected,

Accepted ubuntu-release-upgrader into zesty-proposed. The package will
build now and be available at https://launchpad.net/ubuntu/+source
/ubuntu-release-upgrader/1:17.04.8 in a few hours, and then in the
-proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: ubuntu-release-upgrader (Ubuntu Zesty)
       Status: In Progress => Fix Committed

** Tags added: verification-needed

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https://bugs.launchpad.net/bugs/1692092

Title:
  not possible to upgrade from Xenial and jump over an unsupported
  release

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Zesty:
  Fix Committed

Bug description:
  With the changes to update-manager in bug 1497024 it should be
  possible to upgrade from Ubuntu 16.04 to 17.04 (provided 16.10 is End
  of Life). While update-manager will download the zesty.tar.gz file it
  will not run and will instead say "An upgrade from 'X' to 'Z' is not
  supported with this tool." This is because ubuntu-release-upgrader has
  not been configured to upgrade from 16.04 to 17.04.

  [Test Case]
  1) Run do-release-upgrade (notice it download yakkety.tar.gz)
  2) Set yakkety to unsupported in ~/.cache/update-manager-core/meta-release
  3) Run do-release-upgrade again (notice it download zesty.tar.gz)

  With the dist-upgrader tarball currently available you'll receive an
  error message about the upgrade path being unsupported. With the
  version of the dist-upgrader tarball in proposed (accessible by
  running do-release-upgrade -p and modifying meta-release-proposed in
  the cache folder) you will not receive that error message.

  [Regression Potential]
  It's possible the upgrade won't work for people, but I'll be watching out for issues and its better than we resolve upgrade issues now rather then when people are upgrading from LTS to LTS.

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