[Bug 1856066] [NEW] do-release-upgrade ncorrectly reports no upgrade available if it cannot connect to changelogs.ubuntu.com:443

[Simon Déziel]

Public bug reported:

We use apt-cacher-ng configured as apt proxy on every machine and when
trying to upgrade a Xenial machine, I got this:

# do-release-upgrade 
Checking for a new Ubuntu release
No new release found.

Running tcpdump showed that do-release-upgrade tried to reach
changelogs.ubuntu.com:443 with a proxy CONNECT through our apt-cacher-
ng. Our apt-cacher-ng returned: "403 CONNECT denied (ask the admin to
allow HTTPS tunnels)".

do-release-upgrade should not ignore those errors silently, it should
report whatever failure it received.


# lsb_release -rc
Release:	16.04
Codename:	xenial

# apt-cache policy ubuntu-release-upgrader-core
ubuntu-release-upgrader-core:
  Installed: 1:16.04.29
  Candidate: 1:16.04.29
  Version table:
 *** 1:16.04.29 500
        500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1:16.04.25 500
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
     1:16.04.12 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1856066

Title:
  do-release-upgrade ncorrectly reports no upgrade available if it
  cannot connect to changelogs.ubuntu.com:443

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  We use apt-cacher-ng configured as apt proxy on every machine and when
  trying to upgrade a Xenial machine, I got this:

  # do-release-upgrade 
  Checking for a new Ubuntu release
  No new release found.

  Running tcpdump showed that do-release-upgrade tried to reach
  changelogs.ubuntu.com:443 with a proxy CONNECT through our apt-cacher-
  ng. Our apt-cacher-ng returned: "403 CONNECT denied (ask the admin to
  allow HTTPS tunnels)".

  do-release-upgrade should not ignore those errors silently, it should
  report whatever failure it received.

  
  # lsb_release -rc
  Release:	16.04
  Codename:	xenial

  # apt-cache policy ubuntu-release-upgrader-core
  ubuntu-release-upgrader-core:
    Installed: 1:16.04.29
    Candidate: 1:16.04.29
    Version table:
   *** 1:16.04.29 500
          500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       1:16.04.25 500
          500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
       1:16.04.12 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages

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