[Bug 1199157] Update Released

[Steve Langasek]

The verification of this Stable Release Update 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 regresssions.

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https://bugs.launchpad.net/bugs/1199157

Title:
  proposed should be disabled on upgrade to development release

Status in “ubuntu-release-upgrader” package in Ubuntu:
  Fix Released
Status in “ubuntu-release-upgrader” source package in Raring:
  Fix Released

Bug description:
  [Impact]
  People upgrading from Raring, with -proposed enabled, to Saucy will still have -proposed enabled. Because -proposed is used as a tested bed in Ubuntu+1 this can result in a terrible experience for people.

  [Test Case]
  0) Add raring-proposed to /etc/apt/sources.list
  1) Run do-release-upgrade -d
  2) Upgrade to saucy
  3) Observe that /etc/apt/sources.list has saucy-proposed enabled

  (Its also possible to inspect /etc/apt/sources.list after it has been
  rewritten, when you are presented with the final upgrade prompt, and
  observe that saucy-proposed is present in it.)

  With the version of ubuntu-release-upgrader from raring-proposed
  you'll notice that /etc/apt/sources.list has a comment indicating that
  saucy-proposed is not for humans.

  [Regression Potential]
  Very little as we are just passing the --devel-release option along to the dist upgrader.

  Original Description
  --------------------
  proposed is now used as a testbed and staging area in Ubuntu+1 and is not to be used by humans. I just installed raring in a VM, enabled proposed, and the upgraded with 'do-release-upgrade -d' When finished, proposed is enabled and packages from proposed are installed. There's no guarantee that proposed will even be installable.

  It should be disabled on upgrade to development release.

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