Public bug reported:
automatic upgrade from 18.04.6 LTS to 20.04 LTS was done, but not successfull.
Error message "Could not calculate the upgrade"
last lines in /var/log/dist-upgrade$ cat main.log :
2021-05-20 08:11:42,504 INFO removing python-minimal because python-is-python2
is being installed
2021-05-20 08:11:42,504 DEBUG Removing 'python-minimal' (python-is-python2 is
being installed on the system)
2021-05-20 08:11:42,504 INFO failed to remove python-minimal
2021-05-20 08:11:42,504 INFO checking for python-dev (auto_inst=True)
2021-05-20 08:11:42,504 INFO checking for libpython-dev (auto_inst=True)
2021-05-20 08:11:42,504 INFO checking for libpython-stdlib (auto_inst=True)
2021-05-20 08:11:42,504 INFO removing libpython-stdlib because None is being
installed
2021-05-20 08:11:42,504 DEBUG Removing 'libpython-stdlib' (None is being
installed on the system)
2021-05-20 08:11:42,504 INFO failed to remove libpython-stdlib
2021-05-20 08:11:42,505 INFO checking for libpython-dbg (auto_inst=True)
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.44
ProcVersionSignature: Ubuntu 4.15.0-143.147-generic 4.15.18
Uname: Linux 4.15.0-143-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Thu May 20 09:00:34 2021
InstallationDate: Installed on 2013-02-06 (3024 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-05-20 (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/1929025
Title:
upgrade from 18.04.5 LTS to 20.4 LTS failed: Could not calculate the
upgrade
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