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

[Tom H]

On Sat, Sep 29, 2018 at 5:29 PM Thorsten Schöning <tschoening at am-soft.de> wrote:
> am Samstag, 29. September 2018 um 16:42 schrieben Sie:


> Guten Tag Tom H,

Guten Abend!


>> 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.
>
> How do I switch between both? Do you know any reasons why things have
> changed?

Ubuntu's changed its default installer from Debian's d-i to its own
subiquity. The latter uses a different, new preseeding system, curtin.

If you look at the files with "curtin" in their names under
"/var/log/installer/", you'll see the yaml format of the preseed files
(like the yaml files that netplan's been using for the last few
releases). I have no idea how to use them to preseed a pxe install
with curtin, the way that you can with d-i (and with
kickstart/anaconda in the RH world), or even whether it can be used in
that way, but it's interesting (to me!) to see what the installer's
being fed. Compared to a d-i preseed, the partitioning directives, for
example, aren't obtuse.

The ISOs are available at these URLs:

subiquity
http://releases.ubuntu.com/bionic/

d-i
http://cdimage.ubuntu.com/releases/bionic/release/