[Bug 1998947] Re: restore reboot notification so that users are notified after unattended-upgrades

[Robie Basak]

> Currently, update-notifier will display the notification even if
update-manager's previous notification is still open.

This sounds like a bug to fix in Mantic then? And in that case, should
we defer this SRU so that we only have to update stable releases with
the final fix?

What do you think?

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https://bugs.launchpad.net/bugs/1998947

Title:
  restore reboot notification so that users are notified after
  unattended-upgrades

Status in update-notifier package in Ubuntu:
  Fix Released
Status in update-notifier source package in Jammy:
  In Progress
Status in update-notifier source package in Lunar:
  In Progress

Bug description:
  [Impact]

  There is not currently a user-friendly way to be notified that a
  reboot is required as a result of a package that was upgraded during
  unattended-upgrades. The reboot notification in update-notifier that
  was removed long ago would serve this purpose.

  The main rationale for this is that we needed to enable this for a
  special jammy-based customer and we do not want this functionality to
  regress whenever a new update-notifier is released. We think that this
  change will benefit all Ubuntu users. It does change the behavior, but
  we think it's a change that is acceptable.

  We're open to discussion with the SRU team about this.

  [Test Plan]

  1. Install update-notifier from jammy-proposed.
  2. Reboot
  3. Install a package, or install updates, so that /var/lib/dpkg/info is updated.
  4. If needed, touch /var/run/reboot-required (this might actually happen depending on what you install/update).
  5. Wait 3 hours for the reboot notification to appear.
  6. Click on the notification icon to show the option to reboot, and click on that.

  [Where problems could occur]

  Bringing back old code may reveal bugs in the old code that would have
  been found if it was maintained all this time. Besides that, if we saw
  regressions introduced by this it would likely be related to the
  monitoring of other files.

  [Other information]

  We are mainly interested in SRU'ing to Jammy because that's where the
  use case exists, but we can keep Lunar up-to-date as well.

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