Ubuntu +standard templates fail to build because lacking dnf

[unman]

Qubes OS version

4.0

Affected component(s) or functionality

Qubes builder - Ubuntu templates

Brief summary

+standard variants fail to build because dnf is not available pre Gibbon.

How Reproducible

100%

To Reproduce

Steps to reproduce the behavior:

1. Attempto to build focal+standard template

Expected behavior

Template is built

Actual behavior

No template is built - cannot install vm-recommended meta package

Screenshots

Additional context

Solutions you've tried

Relevant documentation you've consulted

Related, non-duplicate issues

5940

[github-actions[bot]]

This issue is being closed because:

• This issue is on the "Release 4.0 updates" milestone.
• Qubes OS 4.0 reached EOL (end-of-life) over one year ago.
• There has not been any activity on this issue in over one year.

If anyone believes that this issue should be reopened and reassigned to an active milestone, please leave a brief comment. (For example, if a bug still affects Qubes OS 4.1, then the comment "Affects 4.1" will suffice.)