do-release-upgrade prints misleading message

[Athos Ribeiro]

While running noble, after the oracular archive opening but before https://changelogs.ubuntu.com/meta-release-development being updated to include oracular, i.e., the meta-release-development file lists mantic and noble, I run:

$ sudo do-release-upgrade -d

And get the following output:

Checking for a new Ubuntu release
Upgrades to the development release are only
available from the latest supported release.

/etc/update-manager/release-upgrades is set with "Prompt=normal".

At this point, I would expect the upgrade attempt output to be more friendly. While I would not expect the tool to know we are in a corner-case state where there is a new active development release but the remote metadata file is not updated yet. However, I wonder if it should say something else instead, such as saying that there is no development release to upgrade to (since that is the case based in the information given by the metadata file).

Note that, if I set /etc/update-manager/release-upgrades with "Prompt=lts" and run

$ sudo do-release-upgrade -d

I get the following output:

Checking for a new Ubuntu release
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.

Which is expected.