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

[Brian Murray]

Here is the list of autoremovable packages after upgrading with u-r-u
version 20.04.25:

Reading package lists...
Building dependency tree...
Reading state information...
The following packages will be REMOVED:
  adium-theme-ubuntu binutils-common command-not-found-data cpp-7 diffstat
  fwupdate gcc-7-base gcc-8-base geoip-database gir1.2-mutter-2
  gnome-software-common gnome-user-guide gsfonts guile-2.0-libs
  imagemagick-6-common iputils-arping libalgorithm-diff-perl
  libalgorithm-diff-xs-perl libalgorithm-merge-perl libappstream-glib8
  libapt-pkg-perl libarchive-zip-perl libargon2-0 libart-2.0-2
  libasync-mergepoint-perl libatomic1 libb-hooks-endofscope-perl
  libb-hooks-op-check-perl libbind9-160 libbinutils libboost-date-time1.65.1
  libboost-filesystem1.65.1 libboost-iostreams1.65.1 libboost-system1.65.1
  libbrlapi0.6 libc-dev-bin libc6-dev libcamel-1.2-61 libcdio17
  libcgi-fast-perl libcgi-pm-perl libclass-accessor-perl
  libclass-method-modifiers-perl libclass-xsaccessor-perl libclone-perl
  libcommon-sense-perl libcrypt-dev libctf0 libdevel-callchecker-perl
  libdevel-size-perl libdigest-bubblebabble-perl libdns1100
  libdynaloader-functions-perl libebook-contacts-1.2-2 libecal-1.2-19
  libedataserver-1.2-23 libevent-2.1-6 libexiv2-14 libexporter-tiny-perl
  libfcgi-perl libffi6 libfftw3-double3 libfile-copy-recursive-perl
  libfont-ttf-perl libfuture-perl libgail-3-0 libgdbm5 libgeoip1
  libgmime-3.0-0 libgnome-desktop-3-17 libgtksourceview-3.0-1
  libgtksourceview-3.0-common libgutenprint-common libgutenprint2
  libgutenprint9 libgweather-3-15 libhogweed4 libhunspell-1.6-0 libicu60
  libilmbase12 libilmbase24 libimport-into-perl libindicator3-7 libio-pty-perl
  libio-string-perl libip4tc0 libip6tc0 libipc-run-perl libiptc0 libirs160
  libisc169 libisccc160 libisccfg160 libisl19 libitm1 libjson-c3
  libjson-xs-perl liblinux-epoll-perl liblist-compare-perl
  liblist-moreutils-perl liblouis14 liblouisutdml8 liblqr-1-0 liblsan0
  liblwres160 libmagickcore-6.q16-3 libmagickcore-6.q16-6 libminiupnpc10
  libmodule-implementation-perl libmodule-runtime-perl libmoo-perl
  libmoox-aliases-perl libmozjs-52-0 libmutter-2-0 libnamespace-clean-perl
  libncurses5 libncursesw5 libnet-domain-tld-perl libnet-ip-perl libnettle6
  libnss-myhostname libntfs-3g88 libnumber-compare-perl liboauth0 libopenexr22
  libopenexr24 liborcus-0.13-0 libpackage-stash-perl libpackage-stash-xs-perl
  libparams-classify-perl libparse-debianchangelog-perl libpath-tiny-perl
  libperl4-corelibs-perl libperl5.26 libperlio-gzip-perl libplymouth4
  libpoppler73 libprotobuf10 libpython2.7 libpython2.7-minimal
  libpython2.7-stdlib libpython3.6 libpython3.6-minimal libpython3.6-stdlib
  libqpdf21 libquadmath0 libraw16 libreadline7 libreadonly-perl
  libref-util-perl libref-util-xs-perl libreoffice-avmedia-backend-gstreamer
  libreoffice-style-galaxy librole-tiny-perl libsane1 libsereal-decoder-perl
  libsereal-encoder-perl libsereal-perl libssl1.0.0 libstrictures-perl
  libsub-exporter-progressive-perl libsub-identify-perl libsub-quote-perl
  libtest-fatal-perl libtest-refcount-perl libtext-levenshtein-perl libtinfo5
  libtsan0 libtype-tiny-perl libtype-tiny-xs-perl libtypes-serialiser-perl
  libubsan1 libunicode-utf8-perl libusbmuxd4 libvariable-magic-perl libvpx5
  libxml-simple-perl libxml-writer-perl libzeitgeist-2.0-0
  linux-generic-hwe-18.04 linux-headers-generic-hwe-18.04
  linux-hwe-5.4-headers-5.4.0-45 linux-hwe-5.4-headers-5.4.0-47
  linux-image-generic-hwe-18.04 linux-libc-dev multiarch-support nplan
  patchutils pppconfig printer-driver-gutenprint python-talloc
  python3-asn1crypto python3-oauth python3-simplegeneric
  python3-zope.interface python3.6 python3.6-minimal qpdf t1utils
  ubuntu-system-service xserver-xorg-core-hwe-18.04 xserver-xorg-hwe-18.04
  xserver-xorg-input-all-hwe-18.04 xserver-xorg-input-libinput-hwe-18.04
  xserver-xorg-input-wacom-hwe-18.04 xserver-xorg-legacy-hwe-18.04
  xserver-xorg-video-amdgpu-hwe-18.04 xserver-xorg-video-ati-hwe-18.04
  xserver-xorg-video-fbdev-hwe-18.04 xserver-xorg-video-intel-hwe-18.04
  xserver-xorg-video-nouveau-hwe-18.04 xserver-xorg-video-qxl-hwe-18.04
  xserver-xorg-video-radeon-hwe-18.04 xserver-xorg-video-vmware-hwe-18.04
0 upgraded, 0 newly installed, 214 to remove and 0 not upgraded.
After this operation, 457 MB disk space will be freed.
Do you want to continue? [Y/n] Abort.

Attached is the list of packages installed after the autoremove.

** Attachment added: "uru-20.04.25-installed-after-autoremove.txt"
   https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1894919/+attachment/5411895/+files/uru-20.04.25-installed-after-autoremove.txt

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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:
  Invalid
Status in ubuntu-release-upgrader source package in Focal:
  Fix Committed

Bug description:
  [Impact]
  Many packages are not considered for removal by the release upgrader when upgrading from bionic to focal because gnome-software-plugin-snap is a part of the removal set but is not itself considered for removal. However, if you run 'sudo apt autoremove' after upgrading from bionic to focal you will have a lot of packages which will be auto removed.

  [Test Case]
  1) Upgrade an 18.04 system with ubuntu-desktop installed to Ubuntu 20.04 (do-release-upgrade -d)
  2) At the end of the upgrade choose to remove unneeded packages
  3) When the upgrade has finished run 'sudo apt autoremove' and observe that the list of packages in comment #3 are all removable.

  With the version of the release-upgrader from -proposed the packages
  listed in comment #3 will be removed as a part of the upgrade process
  and will not appear in the list of packages 'sudo apt autoremove'
  wants to remove.

  Additionally, we should ensure that nothing extra is autoremoved by
  collecting and comparing the list of packages installed after an
  upgrade with and without the dist-upgrader from -proposed. We'll want
  to make sure that only the packages that are in the 'sudo apt
  autoremove' list are not installed on the system that used the dist-
  upgrader from -proposed.

  [Regression Potential]
  While this change should only affect systems with the ubuntu-desktop or ubuntu-kylindesktop metapackage installed we should also test the upgrade of a different flavor (xubuntu-desktop) which depends on gnome-software-plugin-snap to ensure that it is not removed.

  
  Original 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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