Modifying a BTRFS filesystem UUID

With the program btrfstune, which is part of more recent versions of the normal btrfs-tools, the UUID of a offline file system can be changed. If the partition is eg. /dev/sda1, use following command to generate a new, random UUID:

btrfstune -u /dev/sda1

To specify which value should be used, use an uppercase -U followed by a (valid) UUID string, for example:

sudo btrfstune -U e0c5b943-1c02-44a2-bbaf-87ebda5e363b /dev/sdaX