Update manager fails to dist-upgrade with IPv6-only connection
Binary package hint: update-manager
A maverick install that only has an IPv6 only connection (and even an IPv6 mirror or apt package cache configured) will not detect the natty upgrade through the update manager. If you run check-new-release you get the right result, and if you run do-release-upgrade it knows, but Update manager doesn't know until you give it a IPv4 connection and then have it recheck for updates. Once it knows, it will complain if of not being able to get the release notes if it is switched back to v6 only.
Set the internet connection of a Ubuntu install that doesn't know about the Natty release to having IPv4 set to disabled. (Edit connection -> IPv4 tab -> Set menu to disabled. Apply. Reconnect.)
Configure apt to use either an IPv6 available package cache or an IPv6 available mirror.
Open update manager and have it check for new updates.
Notice that it never discovers that there's a new Natty release.
Run check-new-release. Notice it gets the correct result.
Enable IPv4 and recheck. You should get a message that Natty is available.
Disable IPv4. Try to upgrade. Notice you get an error about not being able to get release notes, and you cannot complete the upgrade.
From running wireshark, it looks like Update manager is looking for http://
DistroRelease: Ubuntu 10.10
Package: update-manager 1:0.142.23
Uname: Linux 2.6.35-28-generic x86_64
Date: Mon May 2 17:47:47 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
|tags:||added: lucid precise|