Seleting the runlevel at kernel boot time: Hardy

[Mumia W.]

I'm running Ubuntu Hardy. In Debian Etch, I'm always able to select my 
desired runlevel by appending a number onto the kernel boot command line 
in Grub, e.g. "... root=/dev/sda1 ro 3"

Three would be my desired runlevel. However, Ubuntu Hardy ignores this, 
and it always sends me into runlevel two. How do I use the kernel 
command line to tell Ubuntu what runlevel I desire?