if you're using ubuntu (gnome) rather than kubuntu, you may find gparted to be a little better -- if only because it would load more quickly and the interface will fit in better with the window manager. it is unlikely that it is preinstalled, so you would probably need to install it yourself. you may also have to install libraries for whatever filesystem you want to manipulate. for example, gparted/qtparted -- same program, different frontend -- don't have reiserfs support, so you need to download the libreiserfs packages. it may be that other file systems are also not supported unless you download the libraries for them (FAT32, or NTFS, for instance).
