With the Add/Remove Programs (see Administrative Tasks for more details).
item in the menu, you can install programs to do new things with Xubuntu. You can also remove programs you don't want. You need administrative access to useIf you know the name of a program you want to install, enter it in the Search field. Otherwise, begin by choosing a software category on the left.
Programs that are already installed begin with a check mark next to their name. Uncheck a program if you want to remove it from your computer.
When you click Apply or OK, any new software will be downloaded from the Internet, and Xubuntu will make the changes you selected. If you have not activated the online package archive, you may be asked to insert your Xubuntu CD-ROM to install some packages.
Some software cannot be installed or removed using Add/Remove Applications. If you cannot find the package you are looking for, start the advanced package manager Synaptic (see the section called “Advanced package management”).