[Merge] ~nteodosio/update-manager:no-ua-shell into update-manager:main

[Sebastien Bacher]

Review: Approve

Seems fine from my perspective, I think Grant's comment also got addressed so we should be good to go ... Grant can you confirm it's now fine for you?
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https://code.launchpad.net/~nteodosio/update-manager/+git/update-manager/+merge/456088
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