Feature request: custom LVM layout / LVM manual partitioning

[kfiresmith]

Is there an existing issue for this?

• I have searched the existing issues and found none matching what I'm reporting.

Is the feature related to a problem or existing issue?

This is a continuation of canonical/ubuntu-desktop-installer#229 that didn't make it over from the frozen ubuntu-desktop-installer project.

Canonical were seemingly very close to implementing this last I'd looked but it just hadn't made the cutoff for 22.04.

We're a paying Canonical customer and my goal here is to close the feature/capability gap between Ubuntu and RHEL, especially as this feature is necessary to comply with any sort of control framework (DISA STIG, CIS, etc).

Describe the feature, why the feature matters to you, and what benefits the feature will bring about.

Just as we have with the interactive server installer, we need to be able to create custom LVM partitioning so that our desktops are compliant with NIST 800-171 controls related to using separate partitions for various root paths (/var, /var/log/audit, /home, /tmp, etc).

Extensive context in the aforementioned prior ubuntu-desktop-installer issue 229

Describe any alternatives you've considered.

Currently have to do a server-based install then install Gnome desktop over it using the meta package, which is super annoying.

Additional context

No response