Trying to format a partition to btrfs in palimpsest results in this (untranslated) error:

Error creating file system: Cannot run mkfs: cannot spawn ’mkfs.btrfs -L ”WD30” /dev/dm-5’: Failed to execute child process ”mkfs.btrfs” (No such file or directory)

This seems to be due to btrfs-tools package not being installed currently as gnome-disk-utility doesn’t depend on it, though apparently it should.