Public bug reported:
Upgrade from 18.04 to 20.04:
Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.
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'."
apt.log shows hundreds of broken things.
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: Wed Sep 23 19:03:47 2020
InstallationDate: Installed on 2016-01-04 (1724 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
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 2020-09-23 (0 days ago)
VarLogDistupgradeTermlog:
mtime.conffile..etc.update-manager.release-upgrades: 2020-09-23T18:00:44.468934
** 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/1896848
Title:
Upgrade from 18.04 to 20.04: "An unresolvable problem occurred while
calculating the upgrade." apt.log shows hundreds of broken things.
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https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1896848/+subscriptions
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