[Bug 1927660] [NEW] Update from 18.04 to 20.04 fails to calculate

[David Cameron Staples]

Public bug reported:

Have successfully performed this update with similar extra software
installed, and can't narrow it down to what software is blocking things.
Other bug reports talk about various other packages, many of which I've
tried removing with no improvement.

"apt-get purge libpython-stdlib" seems like an overreaction, and I'm
hoping it's a misdirected diagnosis.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.44
ProcVersionSignature: Ubuntu 4.15.0-142.146-generic 4.15.18
Uname: Linux 4.15.0-142-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: XFCE
Date: Fri May  7 11:16:40 2021
InstallationDate: Installed on 2015-12-03 (1981 days ago)
InstallationMedia: Xubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-05-07 (0 days ago)
VarLogDistupgradeTermlog:

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


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

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https://bugs.launchpad.net/bugs/1927660

Title:
  Update from 18.04 to 20.04 fails to calculate

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

Bug description:
  Have successfully performed this update with similar extra software
  installed, and can't narrow it down to what software is blocking
  things. Other bug reports talk about various other packages, many of
  which I've tried removing with no improvement.

  "apt-get purge libpython-stdlib" seems like an overreaction, and I'm
  hoping it's a misdirected diagnosis.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  ProcVersionSignature: Ubuntu 4.15.0-142.146-generic 4.15.18
  Uname: Linux 4.15.0-142-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Fri May  7 11:16:40 2021
  InstallationDate: Installed on 2015-12-03 (1981 days ago)
  InstallationMedia: Xubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-05-07 (0 days ago)
  VarLogDistupgradeTermlog:

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