How to remove the graphical user interface?

It is not needed to remove the GUI (unity, lightdm, compiz, etc.) from the system.

You can leave it and just make your default boot as a text mode and if once you need a GUI you can restore it easily.

open /etc/default/grub as root in your favourite text editor, for example sudo vi /etc/default/grub And change the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" To GRUB_CMDLINE_LINUX_DEFAULT="text" and update Grub.sudo update-grub Your system will then always boot to text mode.

If you once want to use GUI you can easly start lightdm, the GUI:

sudo service lightdm start

Here are some hints that you may use to increase performance of your system.

None of these answers answers the user's question.

• Advising how to disable the GUI is not removing it.
• Advising how to use a different GUI is not removing it.
• Advising to use a different Linux distro is not removing it.

The commands to remove the GUI are:

sudo apt-get remove ubuntu-desktop
sudo apt-get autoremove

This will remove the Ubuntu Desktop meta-package and all associated packages.

If you're going to answer the question, answer the question.

Alternatively you can install openbox, one of the most lightweight window managers available:

sudo apt-get install openbox openbox-themes obconf obmenu

This automatically adds an openbox session to the login menu. And this is its GUI:

Yep, that's it. Nothing more but a right-click menu. A GUI with an incredibly low RAM footprint, just like you want it.