[mdlug] grub boot loader does not count down

[R KANNAN]

Hello,

I have installed mythbuntu 11.04 on a laptop and I find that the Grub boot
loader screen does not (always) show a countdown. It just waits there with
the default OS (ubuntu) highlighted till a return key is pressed. My
/etc/default/grub has the following line

GRUB_TIMEOUT=10

I see the countdown from 10 seconds appear a few times. Any ideas?

Thanks