[Bug 2033166] [NEW] Update to 22.04 failed due to ¿'unavailable sources'?

[Jackalux]

Public bug reported:

I was updating from 20.04 to 22.04 and don't recall the error message
exactly; I allowed it to log the issue which then asked for info from me
here after dialogue boxes are gone.

I have no further info but debug info will apparently be appended.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.41
ProcVersionSignature: Ubuntu 5.4.0-156.173-generic 5.4.241
Uname: Linux 5.4.0-156-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.11-0ubuntu27.27
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
Date: Sat Aug 26 19:18:49 2023
InstallationDate: Installed on 2020-04-28 (1215 days ago)
InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2023-08-26 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2023-08-26 19:16:51.398010
 Log time: 2023-08-26 19:17:16.627122
 Log time: 2023-08-26 19:18:30.308332
 Log time: 2023-08-26 19:18:54.406264
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade focal

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https://bugs.launchpad.net/bugs/2033166

Title:
  Update to 22.04 failed due to ¿'unavailable sources'?

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

Bug description:
  I was updating from 20.04 to 22.04 and don't recall the error message
  exactly; I allowed it to log the issue which then asked for info from
  me here after dialogue boxes are gone.

  I have no further info but debug info will apparently be appended.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.41
  ProcVersionSignature: Ubuntu 5.4.0-156.173-generic 5.4.241
  Uname: Linux 5.4.0-156-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.11-0ubuntu27.27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  Date: Sat Aug 26 19:18:49 2023
  InstallationDate: Installed on 2020-04-28 (1215 days ago)
  InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2023-08-26 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2023-08-26 19:16:51.398010
   Log time: 2023-08-26 19:17:16.627122
   Log time: 2023-08-26 19:18:30.308332
   Log time: 2023-08-26 19:18:54.406264
  VarLogDistupgradeTermlog:

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