[Bug 1780841] Re: ubuntu-release-upgrader should transition debs to snaps

[Brian Murray]

Testing an upgrade from Ubuntu 16.04 to Ubuntu 18.04 where I modified
/etc/hosts so api.snapcraft.io resolved to 127.0.0.1.

"Connection to Snap Store failed

Your system does not have a connection to the Snap Store. For the 
best upgrade experience make sure that your system can connect to 
api.snapcraft.io. 
Do you still want to continue with the upgrade? 

Continue [yN] y"

So the dialog about the lack of a connection was displayed but later on
I got a crash which is found in bug 1781412.

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https://bugs.launchpad.net/bugs/1780841

Title:
  ubuntu-release-upgrader should transition debs to snaps

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Bionic:
  Fix Committed

Bug description:
  For new installs the desktop version of Ubuntu 18.04 includes snap
  apps of some utilities[1]. To ensure that there is little difference
  between a system upgrading between releases of Ubuntu and fresh
  installs ubuntu-release-upgrader should be modified to install the
  snap format of those utilities and remove the deb format package. This
  should only be done for Ubuntu Desktop installs and if the system has
  a connection to the Snap Store.

  [Test Case]
  1) Install an Ubuntu desktop system with Ubuntu 16.04
  2) Upgrade to Ubuntu 18.04
  3) Run 'snap list'

  With the version of ubuntu-release-upgrader from -proposed you should
  see snaps installed for gtk-common-themes, gnome-calculator, gnome-
  characters, gnome-logs, gnome-system-monitor.  Additionally, the deb
  version of those four packages should be removed, although if one of
  the snaps failed to install then the corresponding deb would not be
  removed.

  It also be good to test that it is still possible to upgrade without a
  connection to the Snap store and to test this only happens on a system
  with ubuntu-desktop installed.

  [Regression Potential]
  Its possible that the snaps could be install on a system without ubuntu-desktop so we should explicitly test that scenario. The snaps installed should be tested briefly to ensure they are launchable and we don't leave upgraders without a calculator.

  [Note]
  This has been done in a DistUpgradeQuirk and will look different for Cosmic than Bionic as the function name includes the release i.e. cosmicPostUpgrade vs bionicPostUpgrade.

  [1] https://wiki.ubuntu.com/BionicBeaver/ReleaseNotes#Ubuntu_Desktop

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