Why does Ubuntu 18.04 doesn't create multiple BTRFS subvolumes anymore during installation by default?

[Tom H]

On Sat, Sep 29, 2018 at 12:51 PM Thorsten Schöning
<tschoening at am-soft.de> wrote:
>
> during installation of Ubuntu 16.04 LTS Server I could choose manual
> partitioning and create a /-partition using BTRFS. The installer
> automatically mapped that to creating one subvolume called @ for /
> itself and and another one called @home for /home.
>
> That doesn't seem to be the case anymore for UB 18.04 LTS Server, I
> only managed to get one BTRFS subvolume for / itself if I only create
> one partition. It seems I'm able to create multiple different
> partitions with different mount points, but I prefer the former
> behaviour of one partition containing multiple subvolumes.
>
> Am I'm doing something wrong or do I miss something in the
> installer-usage or does have things simply changed for some reason? In
> case of the latter, is there any discussion somewhere on why that was
> changed? Did the former setup have any downsides that needed to be
> addressed with the new release? Are there maybe any plans to restore
> the old behaviour if the new installer has matured?

It depends on which installer you use.

If you use the default subiquity installer, you get your current setup.

If you use the no-longer-default d-i installer, you get the previous setup.