Adding a ppa in Ubuntu

PPAs (Personal Package Archive) provide additional resources. They are small repositories you can add to get some special content.

You can add them with Bash:

sudo add-apt-repository ppa:<repository-name>

Lets make an example:

If you want to install Clipgrab, you add the repository first:

sudo add-apt-repository ppa:clipgrab

Then you have to update your sources:

sudo apt-get update

Now you can install clipgrab the usual way:

sudo apt-get install clipgrab

Further Reading