Introduction
I am installing Debian 13 Trixie (recently released as Debian Stable) on a Virtual machine (VM) using the B-TRee File System (BTRFS). The Debian installer supports installing a BTRFS volume to a partition, and creating a single sub volume within. With the terminal I will be modifying a BTRFS volume that spans multiple drives, and contains multiple sub volumes.
A portion of this work will need to be done outside the Debian installer. The most common methods involve either mid install break out or post install. I have not found any information on pre install procedures for this. Looking at the way the Debian installer works this may not be possible.
In this article I will be doing a post install file system modification. To me this seems the most straight forward and easy to understand method.
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