[Bug 1917104] Re: do-release-update from 18.04 to 20.04 failed

[Bill Tian]

> (You mentioned removing "every ppa repository", but did that most
importantly include packages that were installed from those
repositories?)

yes, i don't uninstall those packages that were installed from those
repositories.

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https://bugs.launchpad.net/bugs/1917104

Title:
  do-release-update from 18.04 to 20.04 failed

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

Bug description:
  I cannot upgrade because of non-official software but I removed every
  ppa repository and nothing has changed.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42 [origin: unknown]
  ProcVersionSignature: Ubuntu 5.4.0-67.75~18.04.1-generic 5.4.94
  Uname: Linux 5.4.0-67-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Feb 27 09:26:55 2021
  InstallationDate: Installed on 2019-06-10 (627 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-02-27 (0 days ago)

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