Converting the Raspberry Pi image to Btrfs

[lab.8916100448256]

And I second @wbk regarding yunohost on Ubuntu. That is not a good idea.
You can have a look to what yunohost core dev think of it here :

Yunohost on Ubuntu

Nanopi R4S only works well with Armbian based on Hirsute Ubuntu (daily build). Both Baster and Focal are not fully operational. Is there any way to install Yunohost on Hirsute? Testing/unstable versions will be fine. Thanks in advance.

and here :

Installation Ubuntu 20.04 LTS

Hello, Due to some limitations, i must run a server with Ubuntu 20.04 LTS (else, no server management additions), and can’t use Debian. My goal is to run a limited set of features (eg Nextcloud, Jirafeau,) and use the wonderful SSOwat for user management. Is it possible to run / install from ubuntu the whole installer, or at least try, even if i must install manually some parts ? Thank you !