[Bug 1972124] [NEW] Upgrade prompt shown while upgrade is in progress

[hackel]

Public bug reported:

While upgrading to Ubuntu 22.04 from 21.10, I received a prompt asking
me if I would like to upgrade to the new version.  It seems like some
kind of race condition and the update checker needs to check if an
upgrade is in progress before showing this dialog.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Screenshot from 2022-05-08 17-13-24.png"
   https://bugs.launchpad.net/bugs/1972124/+attachment/5587729/+files/Screenshot%20from%202022-05-08%2017-13-24.png

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https://bugs.launchpad.net/bugs/1972124

Title:
  Upgrade prompt shown while upgrade is in progress

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  While upgrading to Ubuntu 22.04 from 21.10, I received a prompt asking
  me if I would like to upgrade to the new version.  It seems like some
  kind of race condition and the update checker needs to check if an
  upgrade is in progress before showing this dialog.

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