partitioning in ubuntu

1. Load Synaptic (System > Administration > Synaptic Package Manager)
2. Type gparted inside the Quick search box and click the Search button
3. Right-click the Package named “gparted” and select “Mark for Installation”
4. Click the Apply button toward the top of the window
5. Wait for the package to install

from  :  http://chrisjean.com/2009/02/03/partition-manager-in-ubuntu-linux/