[Bug 1874272] Re: Stage "searching for obsolete software" takes a very long time (30 minutes)

[Simon Dalley]

https://launchpad.net/~juliank do you want me to test your patch? What
would be the best way to go about this?

Since this bug doesn't always seem to bite everyone, it is possible that
a pathological combination of installed packages might trigger it?

If you want, I can try and reproduce it with my particular setup.

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Title:
  Stage "searching for obsolete software" takes a very long time (30
  minutes)

Status in ubuntu-release-upgrader package in Ubuntu:
  In Progress
Status in ubuntu-release-upgrader source package in Focal:
  Triaged
Status in ubuntu-release-upgrader source package in Noble:
  In Progress

Bug description:
  Test Case:
  1. Fresh Bionic installation from 18.04.4 + all updates applied
  2. Run: update-manager -d
  3. Proceed with the upgrade.

  Actual Result:
  Everything goes well but the stage "Searching for obsolete software" takes a very long time.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.18
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr 22 10:34:19 2020
  InstallationDate: Installed on 2020-04-20 (2 days ago)
  InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2020-04-22 (0 days ago)
  VarLogDistupgradeTermlog:

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