[Bug 1725605] Re: upgrade to 17.10 uncalculable without universe

[stuart]

This does not fix the issue I had as per Bug #1726347

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https://bugs.launchpad.net/bugs/1725605

Title:
  upgrade to 17.10 uncalculable without universe

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

Bug description:
  [Impact]
  It is not possible for systems without universe enabled and unity installed (a default package) to upgrade to 17.10.

  [Test Case]
  1) On an Ubuntu 17.04 with unity installed ensure universe and multiverse are disabled
  2) Try to upgrade to 17.10

  With the current version of the dist upgrader tarball the upgrade with
  fail. With the version in -proposed (accessible via do-release-upgrade
  -p) the upgrade should succeed.

  [Regression Potential]
  It's possible unity will be recommended for removal in and subsequently removed in some other situations so test an upgrade with universe enabled and the release upgrader from -proposed.

  Original Description
  --------------------
  no update possible towards 17.10

  ProblemType: BugDistroRelease: Ubuntu 17.04
  Package: ubuntu-release-upgrader-core 1:17.04.9
  ProcVersionSignature: Ubuntu 4.10.0-37.41-generic 4.10.17
  Uname: Linux 4.10.0-37-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.20.4-0ubuntu4.5
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sat Oct 21 10:31:58 2017
  InstallationDate: Installed on 2014-11-22 (1063 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: allSourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to zesty on 2017-10-21 (0 days ago)
  VarLogDistupgradeTermlog:

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