[Bug 1901725] Re: check-new-release-gtk tells i386 users Ubuntu 20.04.1 is available

[Guy Rouillier]

Just wanted to add that this affected me also. I've been aware for many
months that support for 32-bit Ubuntu has been dropped.  So, I was
surprised when I started up this system I use only for backups to see
the following message on the console:

====
New release '20.04.1 LTS' available.
Run 'do-release-upgrade' to upgrade to it.
=====

Running do-release-upgrade produces:

=====
Sorry, no more upgrades for this system 

There will not be any further Ubundo-release-upgradetu releases for this system's 
'i386' architecture. 

Updates for Ubuntu 18.04 will continue until April 2023. 
=====

Seems odd to get a message telling me to perform an upgrade, then when
doing that, to be told no upgrade is available.  Why not just display
the second message initially and save me the trip through do-release-
upgrade?

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https://bugs.launchpad.net/bugs/1901725

Title:
  check-new-release-gtk tells i386 users Ubuntu 20.04.1 is available

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

Bug description:
  [Impact]
  Now that the 20.04.1 LTS upgrade is available users on i386 systems are receiving a dialog regarding the upgrade being available. However, it is not as we dropped support for i386 as host architecture. This is confusing and frustrating as after you start the upgrade process you receive a dialog stating that there are no more upgrades for this system.

  [Test Case]
  This test needs to be performed on an i386 system
  First Test
  1) Run /usr/lib/ubuntu-release-upgrader/check-new-release
  2) Observe that it exists 0 and says that "New release '20.04.1 LTS' is available.
  Second Test
  1) Run /usr/lib/ubuntu-release-upgrader/check-new-release-gtk
  2) Observe a dialog box saying "A new version of Ubuntu is available"

  With the version of the ubuntu-release-upgrader from -proposed the
  first test will exit 1 and tell you that release upgrades on i386
  aren't availabile. The second test will silently quit but will log a
  warning which also says there are no further releases of Ubuntu for
  i386.

  [Regression Potential]
  Given that the check-new-release-gtk change has an "if/else" statement which could prevent the new release dialog from appearing we should also test the ubuntu-release-upgrader from -proposed on an amd64 system.

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