[Bug 1692092] Update Released

[Andy Whitcroft]

The verification of the Stable Release Update for ubuntu-release-
upgrader has completed successfully and the package has now been
released to -updates.  Subsequently, the Ubuntu Stable Release Updates
Team is being unsubscribed and will not receive messages about this bug
report.  In the event that you encounter a regression using the package
from -updates please report a new bug using ubuntu-bug and tag the bug
report regression-update so we can easily find any regressions.

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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 Released

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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