Installation failure of Ansible playbook due to deprecated lib2to3 module

[rhiniodontypus]

ModuleNotFound error during playbook run

After updating to the latest Galaxy release (v24.2, galaxy_commit_id: release_24.2) in the ./galaxy/group_vars/galaxyservers.yml config file, the Galaxy Admin tutorial playbook (Revision: 102, Last modified: Apr 8, 2025) deployment fails on Ubuntu 24.04 LTS with the following error:

TASK [galaxyproject.galaxy : Get current Galaxy DB version] *****************************************************
fatal: [localhost]: FAILED! => changed=false
  cmd:
  - /srv/galaxy/venv/bin/python
  - /srv/galaxy/server/scripts/manage_db.py
  - -c
  - /srv/galaxy/config/galaxy.yml
  - db_version
  delta: '0:00:00.765326'
  end: '2025-04-25 18:07:44.262573'
  failed_when_result: true
  msg: non-zero return code
  rc: 1
  start: '2025-04-25 18:07:43.497247'
  stderr: |-
    Traceback (most recent call last):
      File "/srv/galaxy/server/scripts/manage_db.py", line 12, in <module>
        from galaxy.model.migrations.scripts import LegacyManageDb
      File "/srv/galaxy/server/lib/galaxy/model/__init__.py", line 146, in <module>
        from galaxy.files.templates import (
      File "/srv/galaxy/server/lib/galaxy/files/__init__.py", line 16, in <module>
        from galaxy.files.sources import (
      File "/srv/galaxy/server/lib/galaxy/files/sources/__init__.py", line 37, in <module>
        from galaxy.util.template import fill_template
      File "/srv/galaxy/server/lib/galaxy/util/template.py", line 28, in <module>
        from lib2to3.refactor import RefactoringTool
    ModuleNotFoundError: No module named 'lib2to3'
  stderr_lines: <omitted>
  stdout: ''
  stdout_lines: <omitted>
ModuleNotFoundError: No module named 'lib2to3'

---

Workaround

After manually installing

sudo apt install python3-lib2to3

the playbook is running the deployment without further issues.

---

Root Cause

Ubuntu 24.04 LTS uses Python 3.12. The Python lib2to3 package is deprecated since version 3.11 and will be removed completely in version 3.13 (https://docs.python.org/3.11/library/2to3.html).

---

Proposed Fixes

I added a Python and platform version check to the pre-tasks section of the galaxy.yml playbook template to install the lib2to3 package if necessary. As part of the fix I also updated the role versions in requirements.yml, and adjusted the Galaxy release and Miniconda versions in group_vars/galaxyservers.yml. I will create a pull request.