[Bug 1744318] Autopkgtest regression report (ubuntu-release-upgrader/1:16.04.27)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted ubuntu-release-upgrader (1:16.04.27) for xenial have finished running.
The following regressions have been reported in tests triggered by the package:

ubuntu-release-upgrader/1:16.04.27 (armhf)
update-manager/1:16.04.15 (armhf)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/xenial/update_excuses.html#ubuntu-release-upgrader

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/1744318

Title:
  changelogs.ubuntu.com should be using HTTPS

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in update-manager package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Xenial:
  Fix Committed
Status in update-manager source package in Xenial:
  Fix Committed
Status in ubuntu-release-upgrader source package in Bionic:
  Fix Released
Status in update-manager source package in Bionic:
  Fix Released

Bug description:
  [Impact]
  Although the packages listed in meta-release files on changelogs.ubuntu.com are signature-checked there doesn't appear to be any way to verify the meta-release files are valid so a man-in-the-middle could maliciously supply an alternate meta-release.

  meta-release files should be signed with the archive GPG key and/or
  delivered over HTTPS.

  [Test case]
  Block port 80 access to changelogs.ubuntu.com and check that do-release-upgrade still works

  [Regression potential]
  This breaks any clients behind a proxy where HTTPS (CONNECT on the proxy) is not allowed.

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