[Bug 2058821] [NEW] python3.11-venv is missing on 24.04

[Jakub Kuczys]

Public bug reported:

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
```

** Affects: python3.11 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2058821

Title:
  python3.11-venv is missing on 24.04

Status in python3.11 package in Ubuntu:
  New

Bug description:
  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
  ```

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