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[Brian Murray <brian@xxxxxxxxxx>]

MetaRelease.py is actually part of update-manager but bundled with
ubuntu-release-upgrader.  I'm switching the package appropriately.

$ ls -lh DistUpgrade/MetaRelease.py
lrwxrwxrwx 1 bdmurray bdmurray 64 Feb  8 14:32 DistUpgrade/MetaRelease.py -> /usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py

** Package changed: ubuntu-release-upgrader (Ubuntu Xenial) => update-
manager (Ubuntu Xenial)

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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1561215

Title:
  Upgrade to 16.04 blocked by firewall due to HTTP violation

Status in update-manager package in Ubuntu:
  Triaged
Status in update-manager source package in Xenial:
  Triaged

Bug description:
  Upgrading from 15.10 to 16.04 may fail e.g. in corporate environments
  where firewall or IDS/IPS equipment enforce strict HTTP protocol
  usage. The failure occurs right in the beginning of the upgrade, as
  the upgrader fails to retrieve the release announcement that would be
  shown to the user. The problem is the URI in the HTTP request, which
  contains the version string '16.04 LTS' without proper encoding.
  Spaces should be encoded as '%20' in an URI, but method
  _get_release_notes_uri_query_string() in MetaRelease.py of package
  python3-update-manager seems to add the version string dist.version as
  a query parameter to the URI without any encoding:

         # get the version to upgrade to
          q += "ver=%s" % dist.version

  I think it would be necessary to use something like
  urllib.parse.quote(dist.version) instead.

  Below is the problematic HTTP request. It is dropped by the firewalls
  in the corporation where I work. At home the upgrade works without
  problem.

  HEAD /ubuntu//dists/xenial/main/dist-upgrader-all/current/DevelReleaseAnnouncement.html?lang=en_US&os=ubuntu&ver=16.04 LTS HTTP/1.1
  Accept-Encoding: identity
  User-Agent: Python-urllib/3.4
  Connection: close
  Host: archive.ubuntu.com

  
  Release and package info:

  Description:    Ubuntu 15.10
  Release:        15.10

  python3-update-manager:
    Installed: 1:15.10.3
    Candidate: 1:15.10.3
    Version table:
   *** 1:15.10.3 0
          500 http://se.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
          100 /var/lib/dpkg/status

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