[Bug 2144580] [NEW] Failed upgrading Ubuntu 18.04 to 20.04

[Tyler Beadle]

Public bug reported:

Invalid package information

After updating your package information, the essential package 
'ubuntu-minimal' could not be located. This may be because you have 
no official mirrors listed in your software sources, or because of 
excessive load on the mirror you are using. See /etc/apt/sources.list 
for the current list of configured software sources. 
In the case of an overloaded mirror, you may want to try the upgrade 
again later.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.45
ProcVersionSignature: Ubuntu 5.4.0-225.245~18.04.1-generic 5.4.292
Uname: Linux 5.4.0-225-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.29+esm4
Architecture: amd64
CrashDB: ubuntu
Date: Mon Mar 16 08:45:54 2026
DistributionChannelDescriptor:
 # This is the distribution channel descriptor for the OEM CDs
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-bionic-amd64-20190418-59+beaver-osp1+X00
InstallationDate: Installed on 2020-05-15 (2130 days ago)
InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20190418-12:10
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2026-03-16 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2026-03-16 08:36:36.709974
 Log time: 2026-03-16 08:36:40.588412
 Log time: 2026-03-16 08:45:54.618921
 Log time: 2026-03-16 08:45:57.773851

** 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/2144580

Title:
  Failed upgrading Ubuntu 18.04 to 20.04

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

Bug description:
  Invalid package information

  After updating your package information, the essential package 
  'ubuntu-minimal' could not be located. This may be because you have 
  no official mirrors listed in your software sources, or because of 
  excessive load on the mirror you are using. See /etc/apt/sources.list 
  for the current list of configured software sources. 
  In the case of an overloaded mirror, you may want to try the upgrade 
  again later.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.45
  ProcVersionSignature: Ubuntu 5.4.0-225.245~18.04.1-generic 5.4.292
  Uname: Linux 5.4.0-225-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.29+esm4
  Architecture: amd64
  CrashDB: ubuntu
  Date: Mon Mar 16 08:45:54 2026
  DistributionChannelDescriptor:
   # This is the distribution channel descriptor for the OEM CDs
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-bionic-amd64-20190418-59+beaver-osp1+X00
  InstallationDate: Installed on 2020-05-15 (2130 days ago)
  InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20190418-12:10
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2026-03-16 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2026-03-16 08:36:36.709974
   Log time: 2026-03-16 08:36:40.588412
   Log time: 2026-03-16 08:45:54.618921
   Log time: 2026-03-16 08:45:57.773851

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