Comment 28 for bug 1874272

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?