Adding Removing Softwares.

Add/Remove Applications
With the Add/Remove… item in the Applications menu, you can install programs to do new things with Ubuntu. You can also remove programs you do not want. You need administrative access to use Add/Remove Programs (see Administrative Tasks for more details).

If 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 Ubuntu will make the changes you selected. If you have not activated the online package archive, you may be asked to insert your Ubuntu 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”).

Installing packages without an Internet connection
Other than using tools that download packages automatically, it is also possible to use a CD to install packages through a package manager while not connected to the Internet. The Ubuntu installation CD can be used for this purpose, and other CDs with different packages are available as well. Additionally, the program APTonCD can automatically backup installed packages on your system, and create CDs with the contents of various repositories on them.

Installing packages using the Ubuntu installation CD
Some packages from the main and restricted Ubuntu package repositories can be installed from the Ubuntu installation CD. Simply insert your Ubuntu installation CD and open System → Administration → Synaptic Package Manager. To list only packages on the Ubuntu installation CD, click on the Origin button in the lower left corner of Synaptic Package Manager. The packages are listed under the Ubuntu 7.10_Gutsy Gibbon section.

If the packages are not listed, it may be because the CD is not listed as a package repository (the CD should be listed as a repository by default). To add the CD as a package repository:

1.     Eject the CD.

2.     Open the Software Sources dialog by selecting Repositories from the Settings menu of Synaptic Package Manager.

3.     Go to the Third-Party Software tab and click on the Add CD-ROM button.

4.     Insert the CD.

The packages should then be listed.

Enabling other CDs that can be used to install packages
To enable Synaptic to install packages from CDs which contain packages:

1.     Open System → Administration → Synaptic Package Manager.

2.     Open the Software Sources tool by selecting Repositories from the Settings menu of Synaptic Package Manager.