[Bug 1922297] Re: 20.10 to 21.04: snap does not upgrade channel

[Brian Murray]

** Changed in: ubuntu-release-upgrader (Ubuntu Groovy)
       Status: New => In Progress

** Changed in: ubuntu-release-upgrader (Ubuntu Groovy)
     Assignee: (unassigned) => Brian Murray (brian-murray)

** Changed in: ubuntu-release-upgrader (Ubuntu Focal)
       Status: New => In Progress

** Changed in: ubuntu-release-upgrader (Ubuntu Focal)
     Assignee: (unassigned) => Brian Murray (brian-murray)

** Changed in: ubuntu-release-upgrader (Ubuntu Bionic)
     Assignee: (unassigned) => Brian Murray (brian-murray)

** Changed in: ubuntu-release-upgrader (Ubuntu Bionic)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1922297

Title:
  20.10 to 21.04: snap does not upgrade channel

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Bionic:
  In Progress
Status in ubuntu-release-upgrader source package in Focal:
  In Progress
Status in ubuntu-release-upgrader source package in Groovy:
  In Progress
Status in ubuntu-release-upgrader source package in Hirsute:
  Fix Released

Bug description:
  [Impact]

  Snaps tracking a stable/ubuntu-$version (other than gnome-3-34-1804
  and gtk-common-themes) are not upgraded during the release upgrade
  process.

  Per LP: #1827951 and LP: #1748581, it would appear that if a snap is
  tracking a release channel (e.g. latest/stable/ubuntu-20.10), during a
  do-release-upgrade the snap channel should update to the new release.
  Testing of a Google cloud image, from 20.10 to 21.04 the google-cloud-
  sdk does not get updated.

  # Expected result

  After a do-release-upgrade, the snap channel for google-cloud-sdk
  should be updated from "latest/stable/ubuntu-20.10" to
  "latest/stable/ubuntu-21.04".

  # Actual result

  After install, the snap continues to track
  "latest/stable/ubuntu-20.10".

  [Test Plan]
  GCE image test

  1. Boot 20.10 GCE image
  2. snap info google-cloud-sdk --> "latest/stable/ubuntu-20.10"
  3. do-release-upgrade -d
  4. accept defaults and reboot
  5. snap info google-cloud-sdk --> "latest/stable/ubuntu-20.10"

  With the version from -proposed the snap will be tracking
  "latest/stable/ubuntu-21.04"

  Ubuntu Desktop test (regression test)
  1. Create an Ubuntu 20.10 installation (w/ ubuntu-desktop)
  2. Run 'do-release-upgrade -d' to upgrade to Hirsute
  3. Ensure that the gtk-common-themes (and gnome-3-34-1804) snap is now tracking "latest/stable/ubuntu-21.04" via snap-info

  With the version from -proposed the snaps will also be upgraded to
  "latest/stable/ubuntu-21.04".

  [Where Problems could occur]
  This could regress the upgrading of snaps for Ubuntu desktop images but we've identified that and created a regression test for that scenario.

  # Logs

  main.log https://paste.ubuntu.com/p/kbSvM5JMzP/
  screenlog.0 https://paste.ubuntu.com/p/h5kvtcX5Z6/
  apt-term.log https://paste.ubuntu.com/p/gNJVzbtT4Z/

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