Sorry, more basically, you need to perform system operations at the root privilege. So use sudo.
sudo mke2fs -j -b 4096 -m 1 /dev/{partition on your drive to format, like sda1, sda2, sdb1,...}
You may want/need to clear the current partition(s) then create new ones. If so, then something like:
sudo fdisk /dev/{your drive to partition, like sda, sdb,...}
My preferred distribution is gentoo, primarily because of the excellent documentation. Here's gentoo's docs on disk preparation:
http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?chap=4&part=1Just remember that kubuntu uses sudo instead of a root account so prepend the commands with sudo.
HTH,
Roy