Comment 7 for bug 1762741

We really don't want to have 2.4 switch to bootstrapping bionic by default as soon as bionic is released.

We talked about having a switch at 18.04.1 time, but as far as I am aware, we don't yet have a programatic way to determine that release time.

I propose that we keep xenial as the default bootstrap series for 2.4-beta1 and 2.4.0, and we release a point release 2.4.x when the time comes to change bionic to be the default bootstrap and model series.