apt – How are packages suggested and what is the difference between extra and new packages? – Ask Ubuntu https://askubuntu.com/questions/100503/how-are-packages-suggested-and-what-is-the-difference-between-extra-and-new-pack
How to Uninstall Software Using the Command Line in Linux http://www.howtogeek.com/229699/how-to-uninstall-software-using-the-command-line-in-linux/
apt – How to list all installed packages? – Ask Ubuntu http://askubuntu.com/questions/17823/how-to-list-all-installed-packages