[Bug 1943840] Re: [FFe] Update the ubuntu-desktop-minimal seed to use the firefox snap

[Olivier Tilloy]

I opened and closed the stable/ubuntu-21.10 channel for the firefox
snap, per
https://wiki.ubuntu.com/UbuntuSeededSnaps#Channel_availability.

I then tested a dist-upgrade with my branch of ubuntu-release-upgrader
in a clean and fully up-to-date hirsute VM, and I observed that the
firefox snap was being installed and the deb uninstalled, and I also saw
that:

 - the snap-store snap is being upgraded, as expected

 - firefox-locale-* debs are not being removed, they probably should

 - the gnome-3-34-1804 snap isn't being removed, despite becoming
unnecessary (on a clean system with only the minimally seeded snaps − in
practice though it is likely that on an actual system there will be
other snaps that require it)

 - rebooting after the dist upgrade gives a blank login screen, there
appears to be something broken there (probably unrelated to this change)

 - the default firefox launcher in the dock will be removed when the deb
is uninstalled, it would be good to replace it with a launcher for the
snap

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https://bugs.launchpad.net/bugs/1943840

Title:
  [FFe] Update the ubuntu-desktop-minimal seed to use the firefox snap

Status in ubuntu-meta package in Ubuntu:
  Confirmed
Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed
Status in ubuntu-meta source package in Impish:
  Confirmed
Status in ubuntu-release-upgrader source package in Impish:
  Confirmed

Bug description:
  Per Canonical's distribution agreement with Mozilla, we're making the
  snap¹ the default installation of firefox on desktop ISOs starting
  with Ubuntu 21.10.

  The snap is built and published for amd64, armhf and arm64. It is
  jointly maintained by Mozilla and the Ubuntu desktop team, and
  published by Mozilla.

  This requires updating the desktop-minimal seed, as well as ubuntu-
  release-upgrader.

  ¹ https://snapcraft.io/firefox

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