[Bug 1899859] Re: Could not calculate upgrade to Ubuntu 20 due to failure to remove python-minimal

[Brian Murray]

It seems that you only disabled / removed the PPA's from your apt
sources, because the packages from them are still installed the upgrade
was not able to be calculated. You'll need to reenable the PPAs and use
the tool ppa-purge to remove the packages provided by the PPAs and
disable them.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1899859

Title:
  Could not calculate upgrade to Ubuntu 20 due to failure to remove
  python-minimal

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

Bug description:
  Relase:
  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04

  
  Package version:
   apt-cache policy pkgname ubuntu-release-upgrader
  N: Unable to locate package pkgname
  N: Unable to locate package ubuntu-release-upgrader

  
  Expected:

  After removing all 3rd party -ppas due to the error message:
  "
  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

   This was likely caused by:
   * Unofficial software packages not provided by Ubuntu
  Please use the tool 'ppa-purge' from the ppa-purge 
  package to remove software from a Launchpad PPA and 
  try the upgrade again.

  If none of this applies, then please report this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If you want to investigate this yourself the log files in '/var/log/dist-upgrade' will contain details about the upgrade. Specifically, look at 'main.log' and 'apt.log'.
  "

  Results:
  After removing the launchpad ppas the upgrade fails to removing python-minimal

  Relevant log snippet:
  2020-10-14 18:12:23,395 DEBUG Comparing 4.15.0-118 with 
  2020-10-14 18:12:23,395 DEBUG Comparing 4.15.0-121 with 4.15.0-118
  2020-10-14 18:12:23,567 DEBUG /openCache(), new cache size 66678
  2020-10-14 18:12:23,567 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')
  2020-10-14 18:12:23,570 DEBUG quirks: running PreDistUpgradeCache
  2020-10-14 18:12:23,570 DEBUG running Quirks.PreDistUpgradeCache
  2020-10-14 18:12:23,570 INFO installing python-is-python2 because python-minimal was installed
  2020-10-14 18:12:23,570 DEBUG Installing 'python-is-python2' (python-minimal was installed on the system)
  2020-10-14 18:12:23,601 INFO removing python-minimal because python-is-python2 is being installed
  2020-10-14 18:12:23,601 DEBUG Removing 'python-minimal' (python-is-python2 is being installed on the system)
  2020-10-14 18:12:23,601 INFO failed to remove python-minimal
  2020-10-14 18:12:25,318 DEBUG Installing 'xserver-xorg-video-all' (Distro KeepInstalledPkgs rule)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-121.123-generic 4.15.18
  Uname: Linux 4.15.0-121-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Oct 14 18:17:29 2020
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2018-03-14 (945 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-15 (0 days ago)
  VarLogDistupgradeTermlog:

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