Issue/stop using ubuntu module

Description

Stop using the ubuntu module (only used in tests)

Reviewers list

• reviewer 1

Self Check:

Strike through any lines that are not applicable (~~line~~) then check the box

• Changelog entry and version bump inmanta module release --dev [--major|--minor|--patch] [--changelog-message "<your_changelog_message>"]
• Code is clear and sufficiently documented (classes, methods and function docs, document important assumptions, link to reference materials)
• Sufficient test cases (reproduces the bug/tests the requested feature)
• Correct, in line with design
• Type annotations
• Issue is in the review column
• MR is assigned to first reviewer