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

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Matthieu Clemenceau (mclemenceau):

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:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: High
         Status: Confirmed

** Affects: ubuntu-release-upgrader (Ubuntu Focal)
     Importance: High
         Status: Confirmed


** Tags: amd64 apport-bug dist-upgrade focal fr-328 id-5eb44cb5b465575ffac8f476
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Stage "searching for obsolete software" takes a very long time (30 minutes)
https://bugs.launchpad.net/bugs/1874272
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