[Bug 2052546] [NEW] ESM banner shown on unsupported architectures

[Grant Orndorff]

Public bug reported:

On an `armhf` machine (which is not supported under ESM:
https://ubuntu.com/security/esm), MOTD will show

    Expanded Security Maintenance for Applications is not enabled.

    Enable ESM Apps to receive additional future security updates.
    See https://ubuntu.com/esm or run: sudo pro status

which is misleading.

ubuntu-advantage-tools does not create or update an ESM apt cache on
machines that are not supported, so when update-notifier looks for
potential ESM updates, it will always find 0 on an unsupported machine.

When update-notifier finds 0 potential updates from ESM, it should
somehow query if the current machine is supported before showing the
banner.

** Affects: update-notifier (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2052546

Title:
  ESM banner shown on unsupported architectures

Status in update-notifier package in Ubuntu:
  New

Bug description:
  On an `armhf` machine (which is not supported under ESM:
  https://ubuntu.com/security/esm), MOTD will show

      Expanded Security Maintenance for Applications is not enabled.

      Enable ESM Apps to receive additional future security updates.
      See https://ubuntu.com/esm or run: sudo pro status

  which is misleading.

  ubuntu-advantage-tools does not create or update an ESM apt cache on
  machines that are not supported, so when update-notifier looks for
  potential ESM updates, it will always find 0 on an unsupported
  machine.

  When update-notifier finds 0 potential updates from ESM, it should
  somehow query if the current machine is supported before showing the
  banner.

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