[Bug 1636768] Re: Aborting `sudo do-release-upgrade -d` doesn't revert change to lsb_release or revert zesty sources.list entries

[Ads20000]

One of these package upgrades (using the Zesty repositories) may have
changed lsb_release, but I'm pretty sure Yakkety's do-release-upgrade's
fail to abort was what changed the sources.list entries and got me on
the Zesty repositories in the first place. I'm guessing I'm going to
have to do a clean install at some point because of this bug.

http://paste.ubuntu.com/23383020/

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https://bugs.launchpad.net/bugs/1636768

Title:
  Aborting `sudo do-release-upgrade -d` doesn't revert change to
  lsb_release or revert zesty sources.list entries

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

Bug description:
  Aborting the command `sudo do-release-upgrade -d`, when it asks if you
  wish to abort, should revert changes that the command made (if I
  understand correctly, maybe it is not supposed to do so, but then why
  does it give the option to abort at all?) but it doesn't.
  Specifically, it doesn't revert the change to `lsb_release -a` or the
  zesty entries in sources.list to yakkety. Thus, one is using the Zesty
  repositories on a Yakkety machine without realising.

  The behaviour of do-release-upgrade, I think, should be changed so
  that 'abort' reverts any changes that do-release-upgrade made. I would
  also appreciate support on reverting these changes manually however -
  as you can see, ubuntu-bug thinks that I am on Zesty but I am not.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: ubuntu-release-upgrader-core 1:17.04.3 [origin: unknown]
  ProcVersionSignature: Ubuntu 4.8.0-26.28-generic 4.8.0
  Uname: Linux 4.8.0-26-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Oct 26 11:06:27 2016
  InstallationDate: Installed on 2016-06-18 (129 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to zesty on 2016-10-24 (1 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2016-10-24 12:58:54.819707
   Log time: 2016-10-24 12:58:57.281593

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