python3.11-venv is missing on 24.04

[Jakub Kuczys]

When I installed `python3.11` package on Ubuntu 24.04 (I tried the official `ubuntu:24.04` Docker image for ease of reproducibility) and tried running `python3.11 -m venv /tmp/test`, I got the following error message:
```
The virtual environment was not created successfully because ensurepip is not
available. On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.

    apt install python3.11-venv

You may need to use sudo with that command. After installing the python3-venv
package, recreate your virtual environment.

Failing command: /tmp/test/bin/python3.11
```

This would be fine (and is expected on Debian-based systems) but I then tried running the `apt install python3.11-venv` command and have learned that there is no such package available in the 24.04 repositories:
```
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package python3.11-venv is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'python3.11-venv' has no installation candidate
```

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Markus Falb (littlecatordog)]

It disappeared some time after March 16, if I read my CI logs correctly.

[Jakub Kuczys (jackenmen)]

The package seems to be back? https://packages.ubuntu.com/noble/python3.11-venv

[Markus Falb (littlecatordog)]

yes. package back.

[Markus Falb (littlecatordog)]

all python3.11 packages are missing now.
I wonder: will 24.04 ship with python3.11 or not?

[thewade (wade-penner)]

I am getting the same error with Python 3.12 and Ubuntu 24.04. When I try to create the environment it tells me to install python3.11-venv.

I am commenting here to let people who might stumble on this bug know that it is a separate issue and they just need to install python3-venv. I have reported the Python 3.12 issue in bug #2065422.