Comment 10 for bug 1862846

@Alberto

> I thought the installer would work similarly to what the desktop installer
> does with btrfs, where it creates subvolumes for / and /home in the root
> partition (as @ and @home).
>
> On my desktop, when I upgrade I just move @ out of the way (by renaming it)
> and the installer creates a new one.
> This is kinda nice as you can easily keep/revert to the old rootfs by
> just changing which subvol is mounted at boot.

Subiquity/curtin does not have support for btrfs subvolumes.