Just checked the btrfs method with Focal. Briefly:
- If there's an existing install using the @ and @home subvolumes, rename them, adjusting the install's /etc/fstab and whatever grub entries boot it (or set up a new one). A backup might be a very good idea.
- Boot into the iso, using toram as discussed, and open a konsole to run
Code:
$ sudo umount -lrf /isodevice $ ubiquity -b
- Choose a "manual" install, and choose the partition in question for "/". Do not check the format box.
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