[Bug 1976195] Re: Upgrade abort from ubuntu 20.04 to ubuntu 21.10

[Nick Rosbrook]

It looks like the upgrade failure is ultimately caused by pacakges from
the ondrej/php PPA. In particular, libgd3
2.3.0-2+ubuntu16.04.1+deb.sury.org+1 depends on a version of libpng12-0
that creates a conflict for usrmerge.

Please try removing packages from ondrej/php using the `ppa-purge` tool,
and then try the upgrade again.

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

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https://bugs.launchpad.net/bugs/1976195

Title:
  Upgrade abort from ubuntu 20.04 to ubuntu 21.10

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

Bug description:
  Upgrade abort from ubuntu 20.04 to ubuntu 21.10

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.38
  ProcVersionSignature: Ubuntu 5.4.0-113.127-generic 5.4.181
  Uname: Linux 5.4.0-113-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.24
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon May 30 04:55:58 2022
  InstallationDate: Installed on 2018-04-21 (1499 days ago)
  InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2022-05-30 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2022-05-15T07:59:29.309641

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