fcrondyn doesn't work without root password
Binary package hint: fcron
Fcrondyn asks for root's password, therefore it doesn't work with ubuntu without setting a password for root.
Fcron could be very useful to solve the wakeup-
Fcrondyn is able to report next job time and date, for a specific user or system-wide. It could be very easy to use this time with nvram-wakeup, just by creating a fcrontab for root using an @reboot item. Up to now, it doesn't seem to be possible using fcrondyn in a script.