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Default LightDM login screen (Unity Greeter) with user list and Guest Session enabled

1. To disable the LightDM login screen user list and / or Guest Session, firstly create the /etc/lightdm/lightdm.conf.d/ folder in case it doesn't exist, by using the following command:

sudo mkdir -p /etc/lightdm/lightdm.conf.d

2. Next, you need to create a file called 50-my-custom-config.conf under /etc/lightdm/lightdm.conf.d/ To open/create this file using Gedit (as root), use the following command:

gksu gedit /etc/lightdm/lightdm.conf.d/50-my-custom-config.conf

3.a. To hide the LightDM login screen user list (which means you'll have to manually enter your username), paste the following in this file (50-my-custom-config.conf):

[SeatDefaults]
greeter-hide-users=true
greeter-show-manual-login=true

Then save the file.

Here's how LightDM (with Unity Greeter) will look after this change:


3.b. To disable the LightDM Guest Session, paste the following lines in the /etc/lightdm/lightdm.conf.d/50-my-custom-config.conf file:

[SeatDefaults]
allow-guest=false

Then save the file.

Here's a screenshot with the Guest Session disabled in LightDM (with Unity Greeter):


3.c. Of course, you can combine the two. So if you want to hide the LightDM login screen user list and also disable the Guest Session, paste this in the /etc/lightdm/lightdm.conf.d/50-my-custom-config.conf file:

[SeatDefaults]
greeter-hide-users=true
greeter-show-manual-login=true
allow-guest=false

Then save the file.

Here's a screenshot with LightDM (Unity Greeter) in which the user list was hidden and the Guest Session was disabled:


4. And finally, you need to restart LightDM (a logout is not enough). To do this, press ALT + F2 and copy/paste the following command:

gksu service lightdm restart

Then press ENTER.

You can also simply restart your system.

How to revert the changes

To revert the changes made by following the instructions above, all you need to do is remove the /etc/lightdm/lightdm.conf.d/50-my-custom-config.conf file, by using the following command:

sudo rm /etc/lightdm/lightdm.conf.d/50-my-custom-config.conf

Then, restart LightDM as explained under step 4 or reboot your computer.

Default Xubuntu 14.04 LightDM GTK+ Greeter

• Appearance: change LightDM GTK+ Greeter theme, icons, font (with DPI/antialias/subpixel rendering and hinting settings), change the background image or set it to a color, enable user wallpaper if available or change the default user image;
• Panel: change the clock format and redefine indicators (enable/disable indicators or reorder them);
• Window position: change the login dialog window position
• Misc: enable/disable onscreen keyboard, set the timeout until the screen blanks.

Here are a some LightDM GTK+ Greeter Settings screenshots:

Install LightDM GTK+ Greeter Settings In (X,L)Ubuntu

sudo add-apt-repository ppa:kalgasnik/ppa
sudo apt-get update
sudo apt-get install lightdm-gtk-greeter-settings

Arch Linux users can install LightDM GTK+ Greeter Settings via AUR: stable | bzr.