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

[Johan Smolders]

Upgrading from 21.10 to 22.04 same issue.  "Searching for obsolete
software"

Burning 1 core for 100%

/var/log/dist-upgrade/apt.log is spammed with messages like

Starting pkgProblemResolver with broken count: 1
Starting 2 pkgProblemResolver with broken count: 1
Investigating (0) linux-modules-extra-5.13.0-39-generic:amd64 < 5.13.0-39.44 @ii K Ib >
Broken linux-modules-extra-5.13.0-39-generic:amd64 Depends on crda:amd64 < 4.14+git20191112.9856751-1build1 @ii pR >
  Considering crda:amd64 10001 as a solution to linux-modules-extra-5.13.0-39-generic:amd64 -2
Broken linux-modules-extra-5.13.0-39-generic:amd64 Depends on wireless-crda:amd64 < none @un H >
  Or group remove for linux-modules-extra-5.13.0-39-generic:amd64
  MarkDelete linux-modules-extra-5.13.0-39-generic:amd64 < 5.13.0-39.44 @ii K Ib > FU=0

/var/log/dist-upgrade/main.log is spammed with messages like

2022-04-18 22:25:31,314 DEBUG 'fonts-vlgothic' scheduled for remove but not safe to remove, skipping
2022-04-18 22:25:31,377 DEBUG package 'libnspr4:i386' produces an unwanted removal 'firefox-locale-en', skipping
2022-04-18 22:25:40,712 DEBUG 'libnspr4:i386' scheduled for remove but not safe to remove, skipping
2022-04-18 22:25:40,769 DEBUG package 'node-getpass' produces an unwanted removal 'firefox-locale-en', skipping
2022-04-18 22:25:50,094 DEBUG 'node-getpass' scheduled for remove but not safe to remove, skipping
2022-04-18 22:25:50,152 DEBUG package 'libvpx6:i386' produces an unwanted removal 'firefox-locale-en', skipping
2022-04-18 22:25:59,365 DEBUG 'libvpx6:i386' scheduled for remove but not safe to remove, skipping
2022-04-18 22:25:59,429 DEBUG package 'libmbedtls12' produces an unwanted removal 'firefox-locale-en', skipping
2022-04-18 22:26:08,726 DEBUG 'libmbedtls12' scheduled for remove but not safe to remove, skipping
2022-04-18 22:26:08,778 DEBUG package 'libpango-perl' produces an unwanted removal 'firefox-locale-en', skipping
2022-04-18 22:26:18,153 DEBUG 'libpango-perl' scheduled for remove but not safe to remove, skipping
2022-04-18 22:26:18,225 DEBUG package 'plasma-wallpapers-addons' produces an unwanted removal 'firefox-locale-en', skipping
2022-04-18 22:26:27,841 DEBUG 'plasma-wallpapers-addons' scheduled for remove but not safe to remove, skipping
2022-04-18 22:26:27,900 DEBUG package 'plasma-widgets-addons' produces an unwanted removal 'firefox-locale-en', skipping

I used the APT version of Firefox on 21.10, I read it's being replaced
by the SNAP version?  Might that have something to do with it?

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https://bugs.launchpad.net/bugs/1874272

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

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

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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