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Description
Tests are failing because Ubuntu 16.04 build environments are no longer available.
This PR updates the GitHub Actions from Ubuntu 16.04 to Ubuntu 20.04 and uses a newer version of LXD.
This PR also removes various unnecessarily installed packages in order to speed up the test runs.
Please review these changes for correctness. I'm not a GitHub Actions expert.
How Has This Been Tested?
See the green checkmarks below.
Types of changes
Checklist: