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
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