And as far as I know, Ubuntu ships no UI for users to "only install the packages they select" even once they have turned on -proposed. Software Updater could, but even if so, they'd be buried amongst non-"-proposed" updates. That's why I designed the Contributor Console "Updates" tab to show -proposed updates, *only* those, and to let you turn on -proposed as well. <https://wiki.ubuntu.com/ContributorConsole#updates>
And as far as I know, Ubuntu ships no UI for users to "only install the packages they select" even once they have turned on -proposed. Software Updater could, but even if so, they'd be buried amongst non-"-proposed" updates. That's why I designed the Contributor Console "Updates" tab to show -proposed updates, *only* those, and to let you turn on -proposed as well. <https:/ /wiki.ubuntu. com/Contributor Console# updates>