[Merge] ~stgraber/ubuntu-seeds/+git/ubuntu:focal into ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:focal

[Christian Ehrhardt ]

Review: Approve

Ack on both changes
- the MIR is complete for the LXD agent
- and we made other things recommends in the past for similar reasons e.g. to remove them in images known to not need or even fail with them.
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https://code.launchpad.net/~stgraber/ubuntu-seeds/+git/ubuntu/+merge/381171
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