[Bug 1895838] [NEW] Error during release upgrade 18.04 to 20.04

[tuqueque]

Public bug reported:

Update could not be calculated

There was an unsolvable problem calculating the update.

If none of this is applicable, then report this error using
the command "ubuntu-bug ubuntu-release-upgrader-core" in a terminal.
If you want to investigate the problem yourself, the logs in
"/ Var / log / dist-upgrade" contains upgrade details; in
in particular, see "main.log" and "apt.log".

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-117.118-generic 4.15.18
Uname: Linux 4.15.0-117-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Sep 16 09:20:42 2020
InstallationDate: Installed on 2018-09-09 (737 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-09-16 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2020-09-16T07:50:57.843271

** 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/1895838

Title:
  Error during release upgrade 18.04 to 20.04

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

Bug description:
  Update could not be calculated

  There was an unsolvable problem calculating the update.

  If none of this is applicable, then report this error using
  the command "ubuntu-bug ubuntu-release-upgrader-core" in a terminal.
  If you want to investigate the problem yourself, the logs in
  "/ Var / log / dist-upgrade" contains upgrade details; in
  in particular, see "main.log" and "apt.log".

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-117.118-generic 4.15.18
  Uname: Linux 4.15.0-117-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Sep 16 09:20:42 2020
  InstallationDate: Installed on 2018-09-09 (737 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-09-16 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2020-09-16T07:50:57.843271

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