[Bug 1898152] Re: upgrade fails to calculate if gnuradio-dev is installed

[Brian Murray]

I tested the gnuradio-dev test case from the bug description using the
version of the dist-upgrader from -proposed and the calculation
succeeded.

2021-04-01 10:05:24,173 INFO Using config files '['./DistUpgrade.cfg.bionic']'
2021-04-01 10:05:24,173 INFO uname information: 'Linux clean-bionic-amd64 5.4.0-70-generic #78~18.04.1-Ubuntu SMP Sat Mar 20 14:10:07 UTC 2021 x86_64'
2021-04-01 10:05:24,556 INFO apt version: '1.6.12ubuntu0.2'
2021-04-01 10:05:24,556 INFO python version: '3.6.9 (default, Jan 26 2021, 15:33:00) 
[GCC 8.4.0]'
2021-04-01 10:05:24,559 INFO release-upgrader version '20.04.31' started
2021-04-01 10:05:24,563 INFO locale: 'en_US' 'UTF-8'
2021-04-01 10:05:24,631 DEBUG Using 'DistUpgradeViewText' view
2021-04-01 10:05:24,671 DEBUG enable dpkg --force-overwrite
2021-04-01 10:05:24,697 DEBUG creating statefile: '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'

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https://bugs.launchpad.net/bugs/1898152

Title:
  upgrade fails to calculate if gnuradio-dev is installed

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

Bug description:
  Impact
  ------
  Users with the package gnuradio-dev installed on their system are unable to upgrade from Ubuntu 18.04 LTS to Ubuntu 20.04 LTS as the upgrade is not calculatable. Given that changes to the python to python2 quirk have been previously made to ubuntu-release-upgrader we should ensure those previous test cases (LP: #1887544) still work. It isn't necessary to run the full upgrade go though, just calculating it should be sufficient.

  Test Case
  ---------
  [gnuradio-dev]
  1) On an Ubuntu 18.04 LTS system install gnuradio-dev (or some set of packages which depend on it)
  2) Run do-release-upgrade
  3) Observe a message regarding the failure to calculate the upgrade

  With the dist-upgrader from -proposed there will be no such failure to
  calculate the upgrade.

  [python-dbg]
  1) On an Ubuntu 18.04 LTS system install python-qt4-dbg (or some set of packages which depend on it)
  2) Run do-release-upgrade
  3) Observe a message regarding a failure to calculate the upgrade

  With the dist-upgrader from -proposed there will be no such failure to
  calculate the upgrade.

  [python-doc]
  1) On an Ubuntu 18.04 LTS system install python-doc
  2) Run do-release-upgrade
  3) Say Y to removing obsolete packages
  4) Observe that python-doc is still installed on the system

  With the version of the dist-upgrader from -proposed python-doc will
  not be installed after the upgrade and python2-doc will be.

  [python-dev]
  1) On an Ubuntu 18.04 LTS system install python-dev
  2) Run do-release-upgrade
  3) Say Y to removing obsolete packages
  4) Observe that python-dev is still installed on the system

  With the version of the dist-ugprader from -proposed python-dev will
  not be installed after the upgrade and python2-dev will be installed.
  Additionally, python-dev-is-python2 will be installed.

  Where Problems Could Occur
  --------------------------
  As mentioned previously we could cause working upgrade paths with python- packages installed to failed. However, test cases have been added which cover those scenarios.

  SRU Team Special Note
  ---------------------
  This has not been fixed in Groovy because the code is not relevant for the upgrade path to Groovy.

  Original Description
  --------------------
  Fails complaining about possible issue with PPAs. When these are removed fails with no complaints about PPAs or anything else. Just asks for bug to be reported.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
  Uname: Linux 4.15.0-118-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Oct  2 17:14:41 2020
  InstallationDate: Installed on 2016-09-07 (1485 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-02 (0 days ago)
  VarLogDistupgradeTermlog:

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