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

[Thomas Dowd]

Public bug reported:

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:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic dist-upgrade third-party-packages

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to ubuntu-release-upgrader in
Ubuntu.
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:
  New

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:

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1899859/+subscriptions