How to change the Ubuntu 18.04 default greeter?

Question

How can i replace the new gdm3 greeter with unity-greeter in ubuntu 18.04?

Answer 1

There is a nice little blog on doing this: Ubuntu 18.04 – Bring back Lightdm login manager. Here are the steps summarized from the blog:

• To install use: sudo apt-get -y install slick-greeter
• Verify setup using: lightdm --show-config
• Edit the file /etc/lightdm/slick-greeter.conf to setup login screen wallpaper
• To revert back to GDM3 login manager use sudo dpkg-reconfigure lightdm

Answer 2

Simply installing the unity-greeter package will allow you to change the greeter from gdm3 to the ubuntu themed lightdm greeter.

Just run sudo apt-get install unity-greeter lightdm --no-install-recommends

During the configuration step you'll be faced with this window.

Press ↵ Enter and you'll get this choice selection screen

Use the arrow keys to select lightdm and press enter