Public bug reported:
Ubuntu-Release:
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Upgrade to 20.04 doesn't work
"do-release-upgrade" crashes already with:
----------------
It could not be determined which system updates are available
An unsolvable problem occurred during the calculation of System Update
to.
This was caused by:
* System update to a pre-release version of Ubuntu
This is most likely a temporary problem, please try again later.
If none of these apply, please report the error using the
Command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.
If you want to investigate this yourself, you will find a description in the
log files under "/var/log/dist-upgrade" Details on
System update. Look especially at "main.log" and
"apt.log" on.
---------------
I've already tried without success to remove 3rd party package sources
like Steam and WireGuard and removed the installed programs.
Unfortunately I haven't also additional information what happened.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.40
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
Date: Mon Oct 19 01:04:02 2020
InstallationDate: Installed on 2019-01-01 (656 days ago)
InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
ProcEnviron:
LANGUAGE=de_DE
TERM=xterm-256color
PATH=(custom, no user)
LANG=de_DE.UTF-8
SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-10-18 (0 days ago)
VarLogDistupgradeTermlog:
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic dist-upgrade
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https://bugs.launchpad.net/bugs/1900365
Title:
Upgrade from Lubuntu 18.04 to 20.04 not possible
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