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

[Brian Murray]

Attached is a screenshot which illustrates the verification of the
check-new-release-gtk output.

** Attachment added: "bug-1845690.png"
   https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1901725/+attachment/5443579/+files/bug-1845690.png

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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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