Public bug reported:

In the interest of improving release upgrades for users of PPAs a check
was added to ubuntu-release-upgrader to see if the release to which the
system is being upgraded is provided by a sources list entry and if it
is not that entry is disabled. This check uses the function
url_downloadable which is provided by update-manager's utils.py. Come to
find out the url_downloadable check only supports ftp and http, not
https. This can cause a situation where upgrades to the next release of
Ubuntu fail if the system's mirror of the Ubuntu archive is using https.
This is mentioned here - https://bugs.launchpad.net/ubuntu/+source
/ubuntu-release-upgrader/+bug/1807043/comments/10.

While the bug manifests itself in ubuntu-release-upgrader it needs
fixing in update-manager.

** Affects: update-manager (Ubuntu)
     Importance: High
         Status: Triaged

** Changed in: update-manager (Ubuntu)
   Importance: Undecided => High

** Changed in: update-manager (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1823410

Title:
  utils.py's url_downloadable doesn't support https

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