[Bug 1848974] Re: update-notifier fails on ALL sources if ONE source is bad

[Sebastien Bacher]

Thank you for taking the time to report this bug and helping to make
Ubuntu better. Unfortunately, we cannot work on this bug because your
description didn't include enough information. You may find it helpful
to read "How to report bugs effectively"
http://www.chiark.greenend.org.uk/~sgtatham/bugs.html. We'd be grateful
if you would then provide a more complete description of the problem.

We have instructions on debugging some types of problems at
http://wiki.ubuntu.com/DebuggingProcedures.

At a minimum, we need:
1. The specific steps or actions you took that caused you to encounter the problem.
2. The behavior you expected.
3. The behavior you actually encountered (in as much detail as possible).
Thanks! 

** Changed in: update-notifier (Ubuntu)
   Importance: Undecided => Low

** Changed in: update-notifier (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1848974

Title:
  update-notifier fails on ALL sources if ONE source is bad

Status in update-notifier package in Ubuntu:
  Incomplete

Bug description:
  Update-notifier doesn't work at all if *one* package source gives a
  list that can't be parsed. It should still be able to work on packages
  from *other* sources. After seeing the error in the system tray icon,
  I ran:

  ```
  $ sudo apt-get update

  E: Encountered a section with no Package: header
  E: Problem with MergeList /var/lib/apt/lists/adoptopenjdk.jfrog.io_adoptopenjdk_deb_dists_disco_main_binary-amd64_Packages
  E: The package lists or status file could not be parsed or opened.
  ```
  apt-get successfully processed all but one of the package lists, so I would have expected update-notifier to do so as well.

  I had to manually file this bug, because this error also prevents
  ubuntu-bug update-notifier from working (see attached).

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