GParted Partition Manager
GParted is a Gnome-based partition manager (that can be also be used with KDE and other desktops as well). This utility works best as a LiveCD or live-USB.
GParted preinstalled on Ubuntu liveCD
- Boot a Ubuntu live-CD (or live-USB), select "Try Ubuntu", open GParted.
- You can also install the package from a software package manager, or from the command-line terminal:
sudo apt-get install gparted
However, managing partitions on your hard drive intrinsically changes your hard drive. If you accidentally change the partition of the OS to which you have installed the package, you might corrupt your hard drive and your system might become unusable. It is always best to have a GParted LiveCD available for emergencies.