[Bug 1487069] [NEW] "Update" tab confusingly blank when package manager is set to deal with updating

[The Unknown]

Public bug reported:

I have found that if you go into the Thunderbird Preferences, then go to
the "Advanced" section, and then the "Update" tab, you will find that
the page is blank, now even though this is because there are no update
settings in Thunderbird due to the fact that it's the built-in package
manager which will be handling the updates, and not Thunderbird, having
this section blank is rather confusing for many users, so I think that
it would be better if it would give an explanation for why there are no
settings there, for example it could say: "Your built-in package manager
is set to handle these settings.", or something of the sort.

** Affects: mozilla-thunderbird (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1487069

Title:
  "Update" tab confusingly blank when package manager is set to deal
  with updating

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