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

[Conrad Knight]

A google search brought me here... Was this ever solved? I'm  currently
having the same problem, upgrading from 20.10 to 21.04. "Searching for
obsolete software" was displayed about an hour and a half ago, and the
line below says " eading state information... 52%" (I assume there's a
display bug in the output of that last line and there should be a
leading 'R').

One cpu is pegged at 100%, running the upgrade process. /var/log/dist-
upgrade/apt.log is full of lines like:

Starting pkgProblemResolver with broken count: 1
Starting 2 pkgProblemResolver with broken count: 1
Investigating (0) fonts-gujr:amd64 < 2:1.4 @ii K Ib >
Broken fonts-gujr:amd64 Depends on fonts-kalapi:amd64 < 1.0-4 @ii pR >
  Considering fonts-kalapi:amd64 10001 as a solution to fonts-gujr:amd64 0
  Removing fonts-gujr:amd64 rather than change fonts-kalapi:amd64
  MarkDelete fonts-gujr:amd64 < 2:1.4 @ii K Ib > FU=0
Done
  MarkDelete pmidi:amd64 < 1.7.1-1 @ii K > FU=1
  MarkDelete librsvg2-common:i386 < 2.50.3+dfsg-1 @ii K > FU=1
  MarkDelete fonts-navilu:amd64 < 1.2-3 @ii K > FU=1
Starting pkgProblemResolver with broken count: 1
Starting 2 pkgProblemResolver with broken count: 1
Investigating (0) fonts-knda:amd64 < 2:1.3 @ii K Ib >
Broken fonts-knda:amd64 Depends on fonts-navilu:amd64 < 1.2-3 @ii pR >
  Considering fonts-navilu:amd64 10001 as a solution to fonts-knda:amd64 0
  Removing fonts-knda:amd64 rather than change fonts-navilu:amd64
  MarkDelete fonts-knda:amd64 < 2:1.3 @ii K Ib > FU=0
Done

main.log is filling with:

2021-04-24 01:44:16,280 DEBUG package 'python3.9-examples' produces an unwanted removal 'libsnack-alsa', skipping
2021-04-24 01:44:52,824 DEBUG 'python3.9-examples' scheduled for remove but not safe to remove, skipping
2021-04-24 01:44:52,969 DEBUG package 'firebird3.0-common-doc' produces an unwanted removal 'libsnack-alsa', skipping
2021-04-24 01:45:28,698 DEBUG 'firebird3.0-common-doc' scheduled for remove but not safe to remove, skipping
2021-04-24 01:45:29,665 DEBUG package 'libvdpau1:i386' produces an unwanted removal 'libsnack-alsa', skipping
2021-04-24 01:46:05,161 DEBUG 'libvdpau1:i386' scheduled for remove but not safe to remove, skipping
2021-04-24 01:46:05,313 DEBUG package 'python3-sss' produces an unwanted removal 'libsnack-alsa', skipping
2021-04-24 01:46:43,381 DEBUG 'python3-sss' scheduled for remove but not safe to remove, skipping
2021-04-24 01:46:43,517 DEBUG package 'libvo-amrwbenc0:i386' produces an unwanted removal 'libsnack-alsa', skipping
2021-04-24 01:47:19,690 DEBUG 'libvo-amrwbenc0:i386' scheduled for remove but not safe to remove, skipping
2021-04-24 01:47:19,830 DEBUG package 'ruby-svn' produces an unwanted removal 'libsnack-alsa', skipping

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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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