[Bug 1887739] Re: 20.04 failed to calculate upgrade issue

[andrew]

thank you

Despite having purged the PPA's previously. I needed to reinstall the
PPA's and then re-purge them. That solved my issue.

FWIW I used this bash script to find my 'installed' PPA's.

find /etc/apt/sources.list.d -type f -name "*.list" -print0 | \
    while read -d $'\0' file; do awk -F/ '/deb / && /ppa\.launchpad\.net/ {print "sudo ppa-purge ppa:"$4"/"$5}' "$file"; done

reference: https://askubuntu.com/questions/646884/how-can-i-remove-all-
ppa

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https://bugs.launchpad.net/bugs/1887739

Title:
  20.04 failed to calculate upgrade issue

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

Bug description:
  per previous suggestions (in a bug report) i tried "sudo ppa-purge
  ppa:oibaf/graphics-drivers". i don't have that ppa - but still have
  the same issue.

  Thanks for all your invaluable help

  Andrew

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.37
  ProcVersionSignature: Ubuntu 5.3.0-45.37~18.04.1-generic 5.3.18
  Uname: Linux 5.3.0-45-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jul 16 14:15:54 2020
  InstallationDate: Installed on 2019-11-28 (230 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-07-16 (0 days ago)

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