This indeed happens in 14.04 LTS, but is fixed with util-linux 2.25 in Ubuntu 14.10 and vivid.
** Changed in: util-linux (Ubuntu) Status: Incomplete => Fix Released -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to util-linux in Ubuntu. https://bugs.launchpad.net/bugs/1393915 Title: uuidgen --random requires an argument Status in “util-linux” package in Ubuntu: Fix Released Bug description: The man page of 'uuidgen' reports the options -r and --random as equivalent: -r, --random Generate a random-based UUID. This method creates a UUID consisting mostly of random bits. It requires that the operating system have a high quality random number genera‐ tor, such as /dev/random. But --random requires an argument: kurt@rodin:~$ uuidgen -r 4aca676a-a3f1-4217-a35d-031c376c6274 kurt@rodin:~$ uuidgen --random uuidgen: option '--random' requires an argument To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1393915/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp