... Installing Ubuntu and Adding Software Time-tested tools for initially installing Ubuntu, and later adding and managing software, include the APT (Advanced ... available, or unresponsive, try another. IN THIS CHAPTER Installing Ubuntu Working with software repositories Getting software with APT Managing software with Debian package tools Extracting files ... packaging software for Debian-based systems. By gathering software com- ponents in separate Debian packages (.deb extension) the software can not only carry a self-contained archive of the software, ...