Ubuntu is a popular Linux distribution that is known for its ease of use and wide range of applications. However, if you want to install more than the default set of repositories, you may need to add an extra repository. This can be done by opening the Ubuntu Software Center and clicking on the “Add Repository” button. Once the repository has been added, it will be available in the “Software Sources” section of the Ubuntu Software Center. To install a package from this repository, simply click on the package name and then click on the “Install” button. ..
Note that if you are using a different version than Dapper Drake (6.06), you will probably see a different name there, something like breezy or edgy.
deb http://security.ubuntu.com/ubuntu dapper-security universe
Once you are done adding the repositories, you’ll need to run this command:
(Thanks to Gregg in the comments for catching that)
