lubuntu 10.10 and virtualbox guest additions

got this error
"your system does not seem to be set up to build kernel modules"
following this guide,
http://digitizor.com/2009/05/26/how-to-install-virtualbox-guest-additions-for-a-linux-guest/

sudo su
apt-get install dkms gcc
cd /media/VBOXADDITIONS_3.2.10_66523/
sh ./VBoxLinuxAdditions-x86.run