Package Management in Ubuntu GNU / Linux

apt-get – easy to use program to download and install packages on Linux.

How to install / program in Ubuntu?
Installation package (mc) in Ubuntu:
# Sudo apt-get install mc

Installing multiple packages in Ubuntu:
# Sudo apt-get install mc nmap

How to remove a package in Ubuntu Linux?
# Sudo apt-get remove mc

Index update packages in Ubuntu. Packages Repository is here – /etc/apt/sources.list and catalog /etc/apt/sources.list.d.
To update the local package index system, run:
# Sudo apt-get update

And to update the installed packages:
# Sudo apt-get upgrade

Help with apt-get:
# Apt-get help