[Bug 1851098] Re: no changelogs shown after version 1:16.04.16 update

[Sebastien Bacher]

*** This bug is a duplicate of bug 1849004 ***
    https://bugs.launchpad.net/bugs/1849004

** This bug has been marked a duplicate of bug 1849004
   update-manager stop to load update descriptions / changelog

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https://bugs.launchpad.net/bugs/1851098

Title:
  no changelogs shown after version 1:16.04.16 update

Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  Description:	Ubuntu 16.04.6 LTS
  Release:	16.04
  update-manager:
    Installed: 1:16.04.16
    Candidate: 1:16.04.16

  
  I noticed lately that changelogs were not downloading for any Ubuntu packages in update-manager.
  Running from terminal I saw this error:

    File "/usr/lib/python3/dist-packages/UpdateManager/Core/MyCache.py", line 245, in get_changelog_or_news
      "https locations with username/password are not supported to fetch changelogs"

  There are no username/passwords in the changelog pool uri.
  I believe I tracked the error to lines 242-243 in MyCache.py:

      res = urlsplit(uri) 
      if res.scheme == "https" and res.username != "":

  Documentation for 'urlsplit()' indicates res.username should return a 'None' object, not a empty string.
  I believe changing the scheme to "https" revealed this bug. The following works properly:

      if res.scheme == "https" and res.username is not None:

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