[Bug 1896344] Re: ppa-purge doesn't resolve do-release-upgrade to focal

[Brian Murray]

*** This bug is a duplicate of bug 1898152 ***
    https://bugs.launchpad.net/bugs/1898152

Thank you for taking the time to report this bug and helping to make
Ubuntu better. This particular bug has already been reported and is a
duplicate of bug 1898152, so it is being marked as such. Please look at
the other bug report to see if there is any missing information that you
can provide, or to see if there is a workaround for the bug.
Additionally, any further discussion regarding the bug should occur in
the other report.  Please continue to report any other bugs you may
find.

** This bug has been marked a duplicate of bug 1898152
   upgrade fails to calculate if gnuradio-dev is installed

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https://bugs.launchpad.net/bugs/1896344

Title:
  ppa-purge doesn't resolve do-release-upgrade to focal

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

Bug description:
  > lsb_release -rd
  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04

  ubuntu-release-upgrader-core:
    Installed: 1:18.04.38

  
  purged all four configured ppas and expected success or new error message, but again saw from do-release upgrade -d:

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  This was likely caused by: 
  * Unofficial software packages not provided by Ubuntu 
  Please use the tool 'ppa-purge' from the ppa-purge 
  package to remove software from a Launchpad PPA and 
  try the upgrade again.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-117.118-generic 4.15.18
  Uname: Linux 4.15.0-117-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Sep 19 13:13:29 2020
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/tcsh
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-09-19 (0 days ago)

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