Public bug reported:
1) Ubuntu release
Description: Ubuntu 22.04.5 LTS
Release: 22.04
Description: Ubuntu 20.04.6 LTS
Release: 20.04
2)
ubuntu-release-upgrader-core:
Installed: 1:22.04.20
Candidate: 1:22.04.20
Version table:
*** 1:22.04.20 500
500 http://mirrors.ircam.fr/pub/ubuntu/archive jammy-updates/main amd64
Packages
100 /var/lib/dpkg/status
1:22.04.10 500
500 http://mirrors.ircam.fr/pub/ubuntu/archive jammy/main amd64 Packages
3)
From its initial installation with Ubuntu 20.04, this system has been using a
local proxy using its IPv6 address.
This has been configured for apt, which worked fine.
$ cat /etc/apt/apt.conf.d/90curtin-aptproxy
Acquire::http::Proxy "http://[fc00:cafe::1]:3128";;
Acquire::https::Proxy "http://[fc00:cafe::1]:3128";;
However, when I tried to upgrade to 22.04 using do-release-upgrade, the
command failed immediately:
$ sudo do-release-upgrade
proxy 'http://[fc00:cafe::1]:3128' looks invalid
Checking for a new Ubuntu release
Failed to connect to https://changelogs.ubuntu.com/meta-release-lts. Check your
Internet connection or proxy settings
There is no development version of an LTS available.
To upgrade to the latest non-LTS development release
set Prompt=normal in /etc/update-manager/release-upgrades.
4) I expected the upgrade to a newer release to work.
Workaround found:
It was suggested that I add a name for the server in /etc/hosts, which I
did, and then the command ran without a hitch (and once it finished, I
checked the same issue is present on Ubuntu 22.04)
$ grep proxy /etc/hosts
fc00:cafe::1 proxy
$ cat /etc/apt/apt.conf.d/90curtin-aptproxy
Acquire::http::Proxy "http://proxy:3128";;
Acquire::https::Proxy "http://proxy:3128";;
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2085735
Title:
do-release-upgrade fails with an IPv6 address for the proxy
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