Hot to change the runlevel in Ubuntu 9.10

1.To change the runlevel you must edit this file rc-sysinit.conf.

Edit the file as administrator like this:

sudo gedit /etc/init/rc-sysinit.conf

Find the folowing line an put the runlevel number you want.

env DEFAULT_RUNLEVEL=2

Carefull do not let spaces between equal sign and the number.That is it.Reboot and done.

2.If you want to change runlevels just for this session do this:
sudo init 3         (runlevel  numbers 2-5)
runlevel            (this command will show you what runlevel you are running in now)