[Bug 1875107] Re: unable to upgrade with lubuntu-desktop and ubuntu-desktop installed due to xscreensaver

[Brian Murray]

I tested the dist-upgrader tarball from -proposed and was able to
upgrade with both ubuntu-desktop and lubuntu-desktop meta packages
installed. Additionally, xscreensaver remained installed.

Relevant bits of /var/log/dist-upgrade/main.log 
2020-07-21 09:02:44,309 INFO Using config files '['./DistUpgrade.cfg.bionic']'
2020-07-21 09:02:44,309 INFO uname information: 'Linux clean-bionic-amd64 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_
64'
2020-07-21 09:02:44,728 INFO apt version: '1.6.12ubuntu0.1'
2020-07-21 09:02:44,728 INFO python version: '3.6.9 (default, Apr 18 2020, 01:56:04) 
[GCC 8.4.0]'
2020-07-21 09:02:44,732 INFO release-upgrader version '20.04.23' started

...
2020-07-21 09:06:09,648 DEBUG Marking 'ubuntu-desktop' for upgrade
2020-07-21 09:06:09,682 DEBUG Marking 'lubuntu-desktop' for upgrade
2020-07-21 09:06:10,125 DEBUG About to apply the following changes

bdmurray at clean-bionic-amd64:/tmp/focal$ apt-cache policy xscreensaver
xscreensaver:
  Installed: 5.42+dfsg1-1ubuntu1
  Candidate: 5.42+dfsg1-1ubuntu1
  Version table:
 *** 5.42+dfsg1-1ubuntu1 500
        500 http://192.168.10.7/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status


** Tags removed: verification-needed-focal
** Tags added: verification-done-focal

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https://bugs.launchpad.net/bugs/1875107

Title:
  unable to upgrade with lubuntu-desktop and ubuntu-desktop installed
  due to xscreensaver

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

Bug description:
  Impact
  ------
  Users who have both the lubuntu-desktop meta package (which depends on xscreensaver) and the ubuntu-desktop meta package install can not upgrade to the next release of Ubuntu. This is because there is a PostUpgradeRemove rule for the xscreensaver package. This rule has been around since at least Dapper and as far as I know is no longer necessary.

  [Test Case]
  -----------
  1) On an Ubuntu 18.04 LTS system install both the ubuntu-desktop and lubuntu-desktop metapacakges
  2) Run do-release-upgrade -d to upgrade to Ubuntu 20.04 LTS
  3) Observe that the upgrade fails to calculate and notice the following in /var/log/dist-upgrade/main.log:
  2020-07-20 11:37:59,839 DEBUG Marking 'ubuntu-desktop' for upgrade
  2020-07-20 11:38:00,074 DEBUG Marking 'lubuntu-desktop' for upgrade
  2020-07-20 11:38:01,181 WARNING Can't mark 'lubuntu-desktop' for upgrade (E:Unable to correct problems, you have held broken packages.)

  To test the version of the dist-upgrader from -proposed you'll need to
  download the dist-upgrade tarball and extract it in to /tmp/. Then run
  sudo ./focal --frontend DistUpgradeViewText.

  Regression Potential
  --------------------
  The PostUpgradeRemove rule is a holdover from long ago and is no longer necessary. Additionally, the xscreensaver is safe to have installed so there is no chance of regression.

  Original Description
  --------------------
  Trying to upgrade from 19.10 to 20.04. I removed all third party ppas and still didn't work

  ProblemType: BugDistroRelease: Ubuntu 19.10
  Package: ubuntu-release-upgrader-core 1:19.10.15.4
  ProcVersionSignature: Ubuntu 5.3.0-46.38-generic 5.3.18
  Uname: Linux 5.3.0-46-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.8
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Apr 25 18:54:27 2020
  InstallationDate: Installed on 2020-02-04 (81 days ago)
  InstallationMedia: Lubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017.1)
  PackageArchitecture: allSourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to eoan on 2020-04-25 (0 days ago)
  VarLogDistupgradeTermlog:

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