[Merge] ~nteodosio/update-manager:bionic-ua into update-manager:main

[Nathan Teodosio]

Nathan Teodosio has proposed merging ~nteodosio/update-manager:bionic-ua into update-manager:main.

Requested reviews:
  Sebastien Bacher (seb128)
Related bugs:
  Bug #1990450 in update-manager (Ubuntu): "Show potential Ubuntu Pro updates and apt news messages"
  https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1990450

For more details, see:
https://code.launchpad.net/~nteodosio/update-manager/+git/update-manager/+merge/455888

Fix incorrect available version for Ubuntu Pro updates in unattached case.
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