How do I change the login screen in Ubuntu

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How do I change the login screen in Ubuntu

The "custom" background shows for a split second and then fades to the Ubuntu one.
The greeter by default load the selected user background if it is available. A fade transition
used to change between backgrounds of users including greeter default (for guest user). I
think that the question should: How to stop lightdm greeter from loading the user
background?
Be aware of two distinct greeters, default is unity-greeter . I noticed that some answer
here in AU, don't mention this and mix up between them.
Using lightdm-gtk-greeter
GUI tool
1. Install the settings tool
sudo apt install lightdm-gtk-greeter-settings
2. Run it
pkexec lightdm-gtk-greeter-settings
3. In Appearance tab: Select the image
4. On same tab: Unckeck User user wallpaper if available
5. Save & Close
CLI tools
1. Open lightdm greeter settings file
sudo nano /etc/lightdm/lightdm-gtk-greeter.conf
2. Change it this way
[greeter]
background = /usr/share/backgrounds/Spring_by_Peter_Apas.jpg
user-background = false
3. Ctrl + o to save it then Ctrl + x to exit.
Using unity-greeter (default)
Same answer by Serg, I have tested it in a fresh VBox Ubuntu 16.04.
Change the background of the login screen
2/5$ sudo nano /usr/share/glib-
2.0/schemas/10_unity_greeter_background.gschema.override
[com.canonical.unity-greeter]
draw-user-backgrounds=false
background='/usr/share/backgrounds/Spring_by_Peter_Apas.jpg'
$ sudo glib-compile-schemas /usr/share/glib-2.0/schemas
$ sudo service lightdm restart
Some debug hints:
1. Purge lightdm-gtk-greeter settings
sudo apt purge lightdm-gtk-greeter lightdm-gtk-greeter-settings
Or you may want just disabling it temporary
sudo mv /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf
/usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf.disabled
To enable it back
sudo mv /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-
greeter.conf.disabled /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-
greeter.conf
Restarting the lightdm is needed
sudo systemctl restart lightdm
2. Reinstall unity-greeter to remove any change in /usr/share/glib-
2.0/schemas/com.canonical.unity-greeter.gschema.xml
sudo apt install --reinstall unity-greeter
3. Check if there any other dconf override file that take priority
grep -rn -e "com.canonical.unity-greeter" -e "background=" -e "draw-user-
backgrounds=" /usr/share/glib-2.0/schemas/
up vote 3 down vote
To change the login screen in Ubuntu 16.04 I used the following:
gksu gedit /usr/

1 Answer
To switch do the following:
1. Stop iptables if in use:
sudo systemctl stop iptables
2. Make sure iptables are not used by your system anymore:
sudo systemctl mask iptables
3. Check its status:
sudo systemctl status iptables
4. Remove UFW if installed:
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Is there a Firewall for Ubuntu which doesn't
need to be turned on at every reboot like
Gufw
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sudo apt-get remove ufw
Firewalld - Dynamic Firewall Manager
1. Install firewalld :
sudo apt install firewalld
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Plegethos?
2. Check its status:
sudo systemctl status firewalld
3. Enable or disable firewalld:
sudo systemctl [enable | disable ] firewalld
4. Starting and stoping it:
sudo systemctl [ start | stop ] firewalld
So to use it is simply to enable it as in steps 2, then use the man pages to get more information.
See here for more information on how to use firewalld

share/glib-2.0/schemas/10_unity_greeter_background.gschema.override
Insert these lines:
[com.canonical.unity-greeter]
draw-user-backgrounds=false
background='/home/$USER/Pictures/1920x1080-TuxSuckingWindowsTetraWwallpaper.jpg'
# After changing use: sudo glib-compile-schemas /usr/share/glib-2.0/schemas
Where:
$USER = your user ID.
Pictures = your wallpaper directory.
3/51920x1080-TuxSuckingWindowsTetraWwallpaper.jpg = your image file name (can
be .png format too).
# (comment) ... reminds you what to do after changing!
Save the file and exit gedit
Now compile the new login wallpaper with:
sudo glib-compile-schemas /usr/share/glib-2.0/schemas
Last step is to reboot.
Many thanks and credit to Serg: (Change the background of the login screen) Note on my
system this no only changes the initial login screen but also the lock screen login as well.
Point and click with Nautilus to set login screen wallpaper
I wrote a script where you can navigate to a directory / image, right click on it and set it as
login screen / lock screen background using Nautilus (file manager now called "Files"):
Nautilus can set desktop wallpaper. How can it set login and lock screen wallpaper?
up vote 1 down vote
Run sudo lightdm-gtk-greeter-settings (if
installed). Go to the Appearance tab, and select
Background > Image.
Note: If you're selecting an image from your home
folder and the folder's encrypted, it won't work,
because /home/user hasn't been mounted yet.
answered Jan 5 '17 at 9:52
The Holy See
183314
up vote 0 down vote
As @OrganicMarble said, Ubuntu Tweak should do the trick. I installed it and in the
Tweaks tab there is a tab called 'Login settings'. Unlock the page in the top right by entering
the password and you can change the settings wallpaper. Since then my login and lock
screens were changed.
answered Jan 7 '17 at 20:45
Thom Mekelenkamp
1013
up vote 0 down vote
This worked well for me on 16.04 LTS and without installing extra-software
4/5https://www.linuxslaves.com/2016/06/easiest-way-change-ubuntu-login-screen-
background.html
In short: Open sudo gedit /usr/share/gnome-background-properties/xenial-wallpapers.xml
and add your background image to the list. Then open the "Change background image" by
right-clicking on your desktop, select the image and it's done for both working and login
screen. Eventually restart to try it out.
answered Feb 4 at 12:01
Ste
1
up vote 0 down vote
To set the unity greeter as default, in Ubuntu 16.04 login screen, edit the file
/usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf
and change the "greeter-session" line to "greeter-session=unity-greeter"
answered Apr 3 at 10:39
Sunny127
13113
protected by Community♦ Feb 25 at 19:21
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