[Bug 1982643] Re: do-release-upgrade fails with errors

[Nick Rosbrook]

Looking at the attached VarLogDistupgradeMainlog.txt, the mirror you are
using does not have a release file for Jammy:

2022-07-23 00:21:17,081 DEBUG examining: 'deb http://mirror.cedille.club/ubuntu/ impish main restricted'
2022-07-23 00:21:17,081 DEBUG verifySourcesListEntry: deb http://mirror.cedille.club/ubuntu/ jammy main restricted
2022-07-23 00:21:17,081 DEBUG url_downloadable: http://mirror.cedille.club/ubuntu//dists/jammy/Release
2022-07-23 00:21:17,081 DEBUG s='http' n='mirror.cedille.club' p='/ubuntu//dists/jammy/Release' q='' f=''
2022-07-23 00:21:17,156 DEBUG error from httplib: 'HTTP Error 404: Not Found'

Please choose a different mirror of the Ubuntu archive, and then try the
upgrade again.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1982643

Title:
  do-release-upgrade fails with errors

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

Bug description:
  do-release-upgrade is unable to install kubuntu-desktop and so fails
  with unknown error :-(

  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: ubuntu-release-upgrader-core 1:21.10.10 [origin: unknown]
  ProcVersionSignature: Ubuntu 5.13.0-52.59-generic 5.13.19
  Uname: Linux 5.13.0-52-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu71.2
  Architecture: amd64
  CasperMD5CheckResult: pass
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Sat Jul 23 00:22:23 2022
  InstallationDate: Installed on 2022-01-25 (179 days ago)
  InstallationMedia: Kubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to impish on 2022-07-23 (0 days ago)

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