-if ! btrfs subvolume list $mnt | grep "_$distro$" &>/dev/null; then
- echo "$0: error: _$distro$ not found in btrfs subvolume list $mnt:"
+if ! btrfs subvolume list $mnt | grep "$distro$" &>/dev/null; then
+ echo "$0: error: $distro not found in btrfs subvolume list $mnt:"