[Bug 1890161] Re: Cannot upgrade from 18.04 to 20.04

[Brian Murray]

This is probably because you've installed gcc-10 packages from an
archive other than the official Ubuntu one. From
VarLogDistUpgradeAptclonesystemstate.tar.gz:

gcc-10-base 10-20200411-1 1

Removing that package and any other ones with the same version may allow
you to complete the upgrade.

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

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https://bugs.launchpad.net/bugs/1890161

Title:
  Cannot upgrade from 18.04 to 20.04

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

Bug description:
  tried to updgrade from 18.04 to 20.04. 
  First try, got an error to purge ppa's which I did
  Second try, got:

  An unresolvable problem occurred while calculating the upgrade.

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
  you want to investigate this yourself the log files in 
  '/var/log/dist-upgrade' will contain details about the upgrade. 
  Specifically, look at 'main.log' and 'apt.log'.

  Checked both log files without any clear indication of what is going
  wrong.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Aug  3 16:33:57 2020
  InstallationDate: Installed on 2020-04-23 (101 days ago)
  InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-08-03 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2020-08-02T14:48:55.126818

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