Running gui on linux

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Start GUI from command line on Ubuntu 20.04 Focal Fossa
Software Requirements and Conventions Used
Start GUI from command line on Ubuntu 20.04 step by step instructions
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How to Install a Desktop (GUI) on an Ubuntu Server
Update Repositories and Packages
Install and set up Display Manager
Install GUI on Ubuntu Server
Ubuntu Desktop
KDE Plasma
XFCE
MATE
LXDE
Switching between GUI
Removing the GUI and Display Manager

Start GUI from command line on Ubuntu 20.04 Focal Fossa

In the following article you will learn how to start GUI (graphical user interface) from command line on Ubuntu 20.04 Focal Fossa.

In this tutorial you will learn:

Software Requirements and Conventions Used

Software Requirements and Linux Command Line Conventions

Category	Requirements, Conventions or Software Version Used
System	Installed Ubuntu 20.04 or upgraded Ubuntu 20.04 Focal Fossa
Software	Installed GUI
Other	Privileged access to your Linux system as root or via the sudo command.
Conventions	# – requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command $ – requires given linux commands to be executed as a regular non-privileged user

Start GUI from command line on Ubuntu 20.04 step by step instructions

Here we already assume that you have successfully installed GUI on your Ubuntu 20.04 system.

$ sudo systemctl isolate graphical

$ sudo systemctl set-default graphical.target

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How to Install a Desktop (GUI) on an Ubuntu Server

Ubuntu Server is a variant of the Ubuntu OS that does not include a graphical user interface (GUI) by default. GUI applications consume system resources needed for server-oriented tasks, so Linux server distributions usually avoid a GUI in favor of the command-line terminal.

Some tools, however, perform better and are easier to manage with a GUI. If you use a tool with a GUI, installing a desktop environment may improve the experience of working with the server.

This guide will show you how to install a desktop (GUI) graphical interface on your Ubuntu server.

A server running Ubuntu Linux Server
A user account with sudo or root privileges
The apt package manager, included by default

Update Repositories and Packages

Start by ensuring the software on the server is up to date.

1. Refresh the repository and package lists, and perform the necessary upgrades with the following command:

sudo apt update && sudo apt upgrade

2. When prompted, hit Y and press Enter to start the upgrade.

Install and set up Display Manager

A display manager is an application that starts the display server, launches the desktop, and manages user authentication. The default GDM3 is a resource-intensive display manager. To conserve system resources, consider a lighter tool, such as SLiM or LightDM.

This guide uses SLiM to illustrate the rest of the GUI installation process.

2. Press Y and then hit Enter to start the installation procedure.

Note: If you prefer to install the LightDM display manager instead, type:

Install GUI on Ubuntu Server

With a display manager installed, proceed to install a GUI. The sections below contain instructions for the most common Linux desktop environments.

Ubuntu Desktop

The default Ubuntu Desktop is a modified version of the GNOME desktop environment.

1. Install Ubuntu Desktop by running the following command:

sudo apt install ubuntu-desktop

Note: if asked, confirm slim as the default desktop manager.

2. Reboot the system when the installation finishes by typing:

Note: If you do not wish to reboot immediately, type the following command to start SLiM:

After the system reboots, a graphical login screen appears. The default display manager generates this screen.

3. Type your username in the field and press Enter to reveal the password field. Enter your password to access the desktop environment.

Note: For the vanilla GNOME experience, install the following packages:

sudo apt install vanilla-gnome-desktop vanilla-gnome-default-settings

KDE Plasma

KDE Plasma is a flexible and customizable desktop environment that provides visual consistency and style while remaining fast and responsive. To install KDE Plasma, use the following command:

sudo apt install kde-plasma-desktop

Reboot the system and log in to access the KDE environment.

XFCE

The XFCE desktop environment is designed to be lightweight and user-friendly. The main package, xfce4-session , provides a bare-bone environment. If you want the full experience, install the xfce4-goodies package as well.

Install the packages with the following command:

sudo apt-get install xfce4-session xfce4-goodies

After you reboot the system and log in, the XFCE desktop appears.

MATE

MATE is a fork of GNOME 2 and a popular graphical interface designed to be light on resource consumption. Install it by executing the following command:

sudo apt install ubuntu-mate-desktop

LXDE

LXDE is a desktop environment with a very lightweight GUI. Use LXDE if you need a graphical interface but want to minimize the impact on system memory and CPU.

To install LXDE on Ubuntu, use the following command:

Switching between GUI

If you install more than one desktop environment, you can switch between different GUIs from your display manager screen. SLiM, for example, lets you cycle through the installed environments by pressing F1 repeatedly. The name of the currently toggled environment is visible at the bottom of the screen.

Removing the GUI and Display Manager

To revert to the command line interface and remove the packages related to the display manager and the desktop environments:

1. Open the terminal, and enter:

sudo apt remove [display-manager] [desktop-environment]

For example, to remove SLiM and LXDE, type:

sudo apt remove slim lxde

2. Reboot the system and log back in.

3. Finish by removing orphaned or unnecessary dependencies with autoremove :

Note: Deploy and manage physical servers in a cloud-like environment with Bare Metal Cloud. To find out more, read about phoenixNAP’s cloud-native dedicated servers.

If you’ve worked extensively with conventional operating systems, it can be challenging to have to work in a command-line interface. Fortunately, Ubuntu — like many Linux systems — is open-source, so there are many available GUIs to install.

After completing this tutorial, you should know how to install a display manager and a desktop environment on your Ubuntu Server.

Marko Aleksić is a Technical Writer at phoenixNAP. His innate curiosity regarding all things IT, combined with over a decade long background in writing, teaching and working in IT-related fields, led him to technical writing, where he has an opportunity to employ his skills and make technology less daunting to everyone.

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