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

[Brian Murray]

To double check my logic I ran an upgrade of a stock Ubuntu desktop
system from bionic to focal and immediately after the upgrade ran 'sudo
apt-get autoremove'. The list of packages marked for removal are the
same as the ones the release-upgrader suggested with my change.

bdmurray at clean-bionic-amd64:/tmp/ubuntu-release-upgrader-idl254bt$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.1 LTS"
bdmurray at clean-bionic-amd64:/tmp/ubuntu-release-upgrader-idl254bt$ sudo apt-get autoremove
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  command-not-found-data diffstat gnome-software-common gsfonts guile-2.0-libs libalgorithm-diff-perl libalgorithm-merge-perl
  libappstream-glib8 libarchive-zip-perl libboost-filesystem1.65.1 libboost-system1.65.1 libcgi-pm-perl libclass-method-modifiers-perl
  libclass-xsaccessor-perl libclone-perl libcommon-sense-perl libcrypt-dev libdigest-bubblebabble-perl libenchant1c2a libexempi3
  libexiv2-14 libfftw3-double3 libgmime-3.0-0 libgtksourceview-3.0-common libgweather-3-15 libindicator3-7 libip4tc0 libip6tc0 libitm1
  libjson-xs-perl liblouis14 liblouisutdml8 liblwres160 libnet-domain-tld-perl libnetpbm10 liboauth0 libprotobuf10 libpython2.7-minimal
  libpython2.7-stdlib libraw16 libref-util-perl libref-util-xs-perl libreoffice-avmedia-backend-gstreamer libreoffice-style-galaxy
  librole-tiny-perl libssl1.0.0 libsub-quote-perl libtest-refcount-perl libtypes-serialiser-perl libunicode-utf8-perl
  linux-hwe-5.4-headers-5.4.0-45 linux-hwe-5.4-headers-5.4.0-47 linux-libc-dev manpages-dev python3-asn1crypto python3-oauth
  python3-simplegeneric python3-zope.interface qpdf xserver-xorg-input-all-hwe-18.04 xserver-xorg-legacy-hwe-18.04
  xserver-xorg-video-ati-hwe-18.04 xserver-xorg-video-fbdev-hwe-18.04 xserver-xorg-video-qxl-hwe-18.04 xserver-xorg-video-radeon-hwe-18.04
  xserver-xorg-video-vesa-hwe-18.04
0 upgraded, 0 newly installed, 66 to remove and 0 not upgraded.
After this operation, 214 MB disk space will be freed.

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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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