We really wish to have flexible names, but unfortunately that will fail to boot.
https://help.ubuntu.com/community/btrfs#The_btrfs-tools_command_.27.27set-default.27.27_will_break_Ubuntu.27s_layout
** Changed in: ubiquity (Ubuntu)
Status: New = Won't Fix
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You received this bug
I fail to see how the option to allow the user to select a subvolume
name other than @ for root and @home for /home would apply in the above
linked instance.
Unless I am reading that information incorrectly, as long as the
corresponding subvolumes described in the mount options for / and /home
