[Bug 1929013] [NEW] upgrade of server from Ubuntu 18.04 LTS to Ubuntu 20.04 LTS fail

[Ruediger Fichter]

Public bug reported:

Upgrading a server installation from 18.04 LTS to 20.04 LTS fails
because an unresolved problem occured while  calulating upgrade. There
is no ppa repo used.

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
Date: Thu May 20 07:01:48 2021
InstallationDate: Installed on 2020-02-07 (467 days ago)
InstallationMedia: Ubuntu-Server 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-05-20 (0 days ago)
VarLogDistupgradeLspcitxt:

** 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/1929013

Title:
  upgrade of server from Ubuntu 18.04 LTS  to Ubuntu 20.04 LTS fail

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

Bug description:
  Upgrading a server installation from 18.04 LTS to 20.04 LTS fails
  because an unresolved problem occured while  calulating upgrade. There
  is no ppa repo used.

  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
  Date: Thu May 20 07:01:48 2021
  InstallationDate: Installed on 2020-02-07 (467 days ago)
  InstallationMedia: Ubuntu-Server 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-05-20 (0 days ago)
  VarLogDistupgradeLspcitxt:

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