[Bug 1908812] [NEW] Upgrade to ubuntu 20 from ubuntu 18

[magimaidas]

Public bug reported:

An unresolvable problem occurred while calculating the upgrade.

This was caused by: * Upgrading to a pre-release version of Ubuntu This
is most likely a transient problem, please try again later. 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'.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.41
ProcVersionSignature: Ubuntu 5.4.0-58.64~18.04.1-generic 5.4.73
Uname: Linux 5.4.0-58-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.21
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sun Dec 20 14:37:43 2020
InstallationDate: Installed on 2019-11-07 (408 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-12-20 (0 days ago)

** 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/1908812

Title:
  Upgrade to ubuntu 20 from ubuntu 18

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

Bug description:
  An unresolvable problem occurred while calculating the upgrade.

  This was caused by: * Upgrading to a pre-release version of Ubuntu
  This is most likely a transient problem, please try again later. 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'.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.41
  ProcVersionSignature: Ubuntu 5.4.0-58.64~18.04.1-generic 5.4.73
  Uname: Linux 5.4.0-58-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Dec 20 14:37:43 2020
  InstallationDate: Installed on 2019-11-07 (408 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-12-20 (0 days ago)

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