[Bug 1900210] [NEW] I try to upgrade 18.04 to 20.04, and "remove ppa's" from software list, as I believe is expected, but subsequent attempts at upgrade failed at the same point (after apparently loading all required new software)

[Ewan R Colson]

Public bug reported:

Release 18.04.5 LTS
After command <apt-cache policy pkgname> the response was -
N: Unable to locate package pkgname

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-121.123-generic 4.15.18
Uname: Linux 4.15.0-121-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sat Oct 17 10:56:28 2020
InstallationDate: Installed on 2013-11-26 (2516 days ago)
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130213)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-10-16 (0 days ago)
VarLogDistupgradeTermlog:

** 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/1900210

Title:
  I try to upgrade 18.04 to 20.04, and "remove ppa's" from software
  list, as I believe is expected, but subsequent attempts at upgrade
  failed at the same point (after apparently loading all required new
  software)

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

Bug description:
  Release 18.04.5 LTS
  After command <apt-cache policy pkgname> the response was -
  N: Unable to locate package pkgname

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-121.123-generic 4.15.18
  Uname: Linux 4.15.0-121-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Oct 17 10:56:28 2020
  InstallationDate: Installed on 2013-11-26 (2516 days ago)
  InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130213)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-16 (0 days ago)
  VarLogDistupgradeTermlog:

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