[Bug 1894919] Re: gnome-software-plugin-snap consider an unwanted removal for 20.04 ubuntu-desktop

[Brian Murray]

I tested an upgrade where I added gnome-software-plugin-snap to the
ForcedObsoletes section of ubuntu-desktop and the following packages
were marked for removal. (I did a diff of removed packages w/ and w/o
that package in ForcedObsoletes.)

command-not-found-data
example-content
gcc-7-base
imagemagick-6-common
libalgorithm-diff-perl
libart-2.0-2
libasan4
libboost-system1.65.1
libboost-thread1.65.1
libclass-xsaccessor-perl
libcpanel-json-xs-perl
libexempi3
libexiv2-14
libexporter-tiny-perl
libfakeroot
libfuture-perl
libgtksourceview-3.0-common
libgweather-3-15
libhunspell-1.6-0
libhwloc5
libilmbase12
libilmbase24
libio-async-perl
libio-pty-perl
libip4tc0
liblist-compare-perl
liblqr-1-0
libmozjs-52-0
libnet-ip-perl
libnss-myhostname
libnumber-compare-perl
liboauth0
libpackage-stash-xs-perl
libplymouth4
libpython2.7
libraw16
libreoffice-avmedia-backend-gstreamer
libreoffice-style-galaxy
libstruct-dumb-perl
libtest-fatal-perl
libubsan0
libunicode-utf8-perl
libusbmuxd4
libxapian30
libxml-libxml-perl
libxml-namespacesupport-perl
libxml-sax-base-perl
libxml-sax-expat-perl
libxml-sax-perl
libxml-writer-perl
libzeitgeist-2.0-0
light-themes
linux-headers-5.4.0-42
linux-headers-5.4.0-42-generic
linux-hwe-5.4-headers-5.4.0-47
linux-image-5.4.0-42-generic
linux-modules-5.4.0-42-generic
linux-modules-extra-5.4.0-42-generic
python-talloc
python3-asn1crypto
python3-crypto
python3-keyrings.alt
python3-oauth
python3-simplegeneric
python3-zope.interface
python3.6
python3.6-minimal
qpdf
t1utils
ubuntu-sounds
ubuntu-system-service
xserver-xorg-hwe-18.04
xserver-xorg-input-all-hwe-18.04
xserver-xorg-input-libinput-hwe-18.04
xserver-xorg-video-ati-hwe-18.04
xserver-xorg-video-fbdev-hwe-18.04
xserver-xorg-video-intel-hwe-18.04

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https://bugs.launchpad.net/bugs/1894919

Title:
  gnome-software-plugin-snap consider an unwanted removal for 20.04
  ubuntu-desktop

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  I've been testing some release upgrades from 18.04 to 20.04 and
  noticed some packages were not getting removed with the following in
  /var/log/dist-upgrade/main.log.

   2020-09-07 15:57:38,148 DEBUG package 'libxml-sax-expat-perl' produces an unwanted removal 'gnome-software-plugin-snap', skipping
   2020-09-07 15:57:40,290 DEBUG 'libxml-sax-expat-perl' scheduled for remove but not safe to remove, skipping
   2020-09-07 15:57:40,349 DEBUG package 'libexporter-tiny-perl' produces an unwanted removal 'gnome-software-plugin-snap', skipping
   2020-09-07 15:57:42,485 DEBUG 'libexporter-tiny-perl' scheduled for remove but not safe to remove, skipping

  In Ubuntu 18.04 this package was a part of the following tasks:

  Task: ubuntu-desktop, xubuntu-desktop, ubuntustudio-desktop,
  ubuntukylin-desktop, ubuntu-budgie-desktop

  However, for 20.04 it is a part of the following tasks:

  Task: xubuntu-desktop, ubuntustudio-desktop, ubuntu-budgie-desktop

  Because the package is in main it is not a removal candidate itself
  but given that it is no longer part of the ubuntu-desktop and
  ubuntukylin-desktop packages it seems reasonable to add it to
  ForcedObsoletes but only for those 2 metapackages.

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