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There are two primary commands to obtain root (adminstrative, superuser) privileges that you need to make system changes (e.g., installing software) using a terminal.
For any printer, make sure it is connected before trying to install a driver.
A rootkit is a set of tools used by an intruder after cracking a computer system. These tools can help the attacker maintain his or her access to the system and use it for malicious purposes. Root kits exist for a variety of operating systems, including Linux.
Rkhunter is a command line tool that scans for rootkits, backdoors, and possible local exploits. It can be installed from the repos.