Public bug reported:
Not able to upgrade my system to ubuntu 20.04.
Upgrade is aborting because of an unresolvable problem -> "Could not
calculate the upgrade"
I'm using Ubuntu 18.04.4 LTS
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.37
ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30
Uname: Linux 5.4.0-28-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Thu May 28 19:41:58 2020
InstallationDate: Installed on 2020-03-27 (61 days ago)
InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64
(20200203.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-05-28 (0 days ago)
** 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/1881172
Title:
Upgrading from ubuntu 18.04 to 20.04 fails with message "Upgrading to
a pre-release version of Ubuntu"
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