This is a guide containing the most popular and useful ways of using the APT and DPKG commands, and it applies to both Ubuntu and Debian (and their derivatives). I mentioned where super user privileges are required, the ones without a mention can be executed as normal user. If you're using Ubuntu, precede a command with sudo in order to gain root privileges (and enter your user password); on Debian, type su, enter the root password, and then type in the commands as shown below.