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Change display manager

The following guide is to show you how to change your default display manager on Ubuntu 18.04/18.10.ย This could be because you wish to switch back over to Unity, which was removed from Ubuntu 17.10 and up.

1 Check the default display manager

To begin, you need to check the current default display manager.

Open the GNOME Launcher, click on Terminal and type in the command below:

cat /etc/X11/default-display-manager

Ubuntu 18.04.1/18.10 should return:

/usr/sbin/gdm3

2 Install LightDM (Unity) on Ubuntu

Applies to Ubuntu 18.04/18.10:
To install LightDM, type the following:

sudo apt install ubuntu-unity-desktop

Input your password at the authentication prompt. The package will download and install.

3 Configure LightDM

You will then arrive at the Configuring LightDM screen

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4 Select default display manager

Select LightDM to setup Unity as your default (use the arrow keys to select LightDM then press tab to get to the OK button and press enter)

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5 Check which is the default display manager

After the configuration is complete, you can double-check your default display manager is now set to LightDM.
cat /etc/X11/default-display-manager
This should return the following:
/usr/sbin/lightdm
You can now log off/reboot to switch over to Unity.

6 Changing back to GDM

If at any point you would like to change from LightDM back to GDM, open the GNOME Launcher, click on Terminal and type in the command below:
sudo dpkg-reconfigure gdm3