[Merge] ~nteodosio/update-manager:focal-no-attribute into update-manager:ubuntu/focal

[Sebastien Bacher]

Review: Approve

Thanks!

The changelog version used already exists in the archive
https://launchpad.net/ubuntu/+source/update-manager/1:20.04.11

so I'm changing it to 1:20.04.10.22 following the previous upload scheme
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https://code.launchpad.net/~nteodosio/update-manager/+git/update-manager/+merge/466566
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