Comment 2 for bug 1948584

> while honouring the "phased updates" feature that currently (and allegedly) only tool "Update Manager" supports.

the statement isn't accurate anymore, it was added to apt in

https://launchpad.net/ubuntu/+source/apt/2.1.16

The missing blog is unfortunate but the content should probably be moved to the wiki or discourse if it still exists and is useful, not really an update-manager or Ubuntu bug