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How I can change the GDM 3.6 Wallpaper? I dont mean the desktop background, but the Wallpaper at the login (GDM 3.6).
Thanks
Thank you for your answer,
I know exactly what you mean. Recently I had installed LightDm, but today I uninstalled it, and replaced it with GDM. Ubuntu-Tweak dont show the login screen appearance button. I think it's because LightDM is currently not installed. Does anyone know where is the folder where the images are stored?
Also worth mentioning with Ubuntu Artful 17.10, you can revert to the default Gnome 3 theme experience with:
sudo update-alternatives --config gdm3.css
And selecting the default gnome-shell.css option.
Source: https://didrocks.fr/2017/09/11/ubuntu-gnome-shell-in-artful-day-11/
The alternatives system in Debian and Ubuntu relies on "link group" names to configure software or files with similar functionality. A generic name in the /etc/alternatives/ filesystem is shared by all files included within different software packages providing interchangeable functionality.
Note that this "link group" name may be different, even for the same piece of software, depending on which version of Ubuntu or Debian you are working on. To see the available link groups on your system, run:
update-alternatives --get-selections
For this particular example with gdm3, you might want to filter this to only the gdm-related names:
update-alternatives --get-selections` | grep -i gdm
# Returns the following on Ubuntu 20.04 LTS
# gdm3-theme.gresource auto /usr/share/gnome-shell/theme/Yaru/gnome-shell-theme.gresource
To configure this link group name, just pass it along to update-alternatives --config $LINK_GROUP_NAME_HERE (e.g.):
sudo update-alternatives --config gdm3-theme.gresource
sudo update-alternatives --auto gdm3.css gives me update-alternatives: error: no alternatives for gdm3.css
update-alternatives --get-selections | grep -i gdm
May 8 at 22:58
Copy the image you want to use into the /usr/share/gnome-shell/theme folder
sudo gedit /usr/share/gnome-shell/theme/gnome-shell.css
Search for the following section
#lockDialogGroup {
background: #2e3436 url(noise-texture.png);
background-repeat: no-repeat;
Change the name of the image to your image
Set background to repeat or no-repeat
Save the file
Logout and your new background is there
Follow the instructions on the Arch Linux Wiki:
https://wiki.archlinux.org/index.php/GDM#Log-in_screen_background_image
Here is what you need to do:
Create and run the following script (/usr/local/bin/extractgst.sh)
#!/bin/sh
workdir=${HOME}/shell-theme
if [ ! -d ${workdir}/theme ]; then
mkdir -p ${workdir}/theme
fi
gst=/usr/share/gnome-shell/gnome-shell-theme.gresource
for r in `gresource list $gst`; do
gresource extract $gst $r >$workdir/${r#\/org\/gnome\/shell/}
done
#lockDialogGroup)This creates the directory $HOME/shell-theme/theme. Change directory to this location.
Then create the file gnome-shell-theme.gresource.xml in the directory above.
With the following content, while imagefilename must be replaced with the filename of your background image.
<?xml version="1.0" encoding="UTF-8"?>
<gresources>
<gresource prefix="/org/gnome/shell/theme">
<file>imagefilename</file>
<file>calendar-arrow-left.svg</file>
<file>calendar-arrow-right.svg</file>
<file>calendar-today.svg</file>
<file>checkbox-focused.svg</file>
<file>checkbox-off-focused.svg</file>
<file>checkbox-off.svg</file>
<file>checkbox.svg</file>
<file>close-window.svg</file>
<file>close.svg</file>
<file>corner-ripple-ltr.png</file>
<file>corner-ripple-rtl.png</file>
<file>dash-placeholder.svg</file>
<file>filter-selected-ltr.svg</file>
<file>filter-selected-rtl.svg</file>
<file>gnome-shell.css</file>
<file>gnome-shell-high-contrast.css</file>
<file>logged-in-indicator.svg</file>
<file>more-results.svg</file>
<file>no-events.svg</file>
<file>no-notifications.svg</file>
<file>noise-texture.png</file>
<file>page-indicator-active.svg</file>
<file>page-indicator-inactive.svg</file>
<file>page-indicator-checked.svg</file>
<file>page-indicator-hover.svg</file>
<file>process-working.svg</file>
<file>running-indicator.svg</file>
<file>source-button-border.svg</file>
<file>summary-counter.svg</file>
<file>toggle-off-us.svg</file>
<file>toggle-off-intl.svg</file>
<file>toggle-on-hc.svg</file>
<file>toggle-on-us.svg</file>
<file>toggle-on-intl.svg</file>
<file>ws-switch-arrow-up.png</file>
<file>ws-switch-arrow-down.png</file>
</gresource>
</gresources>
Now, open the gnome-shell.css-file in the directory and change the #lockDialogGroup definition as follows:
#lockDialogGroup {
background: #2e3436 url(imagefilename);
background-size: [WIDTH]px [HEIGHT]px;
background-repeat: no-repeat;
}
Set background-size to the resolution that GDM uses, this might not necessarily be the resolution of the image.
Finally, compile the theme using the following command:
glib-compile-resources gnome-shell-theme.gresource.xml
And copy the resulting gnome-shell-theme.gresource-file to the /usr/share/gnome-shell directory.
Eventually restart gdm or just logout.
I created a script which does this with just a few clicks.
You can download it at https://github.com/thiggy01/ubuntu-change-login-background
But before you download, you will need to install yad package for graphical interface. In Ubuntu, you just install it with sudo apt install yad.
After that, you just run sudo ./ubuntu-change-login-background and a window show up for you to choose your favorite image with previews.
When you select your background image, you will see a popup message saying Login image successfully changed. After that, you simply type y or Y to restart your gnome-session and apply the change.
You can see the result below with the beautiful Flat-Remix Gnome theme.
It was never so simple.
sudo apt install libglib2.0-dev-bin 2) Download the script: wget github.com/thiggy01/change-gdm-background/raw/master/change-gdm-background 3) Make it executable chmod +x /PATH/TO/change-gdm-background 4) Set bg image with sudo ./change-gdm-background /PATH/TO/IMAGE or set a bg color with sudo ./change-gdm-background \#yourhexcode.
Dec 11, 2020 at 16:47
Pop_OS! Hirsuite Hippo.
Jul 25, 2021 at 22:53
sudo machinectl shell gdm@ `which gsettings` \
set com.ubuntu.login-screen background-picture-uri /path/to/greeter.jpg
You will need to match the screen size. i.e if you have 2 2k screens the image needs to be 5120x1440.
You can also set color, which will also fill around image if it's not covering the whole screen.
sudo machinectl shell gdm@ `which gsettings` \
set com.ubuntu.login-screen background-color '#9c0031'
There are 2 other keys background-repeat which I assume takes the corresponding css values, haven't checked.
And background-size that takes:
You will need Ubuntu Tweak, if you do not have it already you can install it by running the following codes in the terminal.
sudo add-apt-repository ppa:tualatrix/ppa
sudo apt-get update
sudo apt-get install ubuntu-tweak
Then launch Ubuntu Tweak and search for "login" in the search bar then click on "login settings" then press the unlock button in the top right by the search bar. Then you can edit your login screen as you choose by changing the background or Icon theme ect.
This should work for both GDM login as well as LightDM.
Source: http://www.techdrivein.com/2011/01/how-to-change-gdmlogin-screen.html
How to change Gnome 3 lock screen background:
/usr/share/gnome-shell/theme/noise-texture.png
noise-texture.png as noise-texture.png.bak (as root)noise-texture.png (as root)(Every update to gnome-shell will replace your noise-texture.png with the original, so you have keep repeating the above after every gnome-shell upgrade)
I just went exploring. Check out /etc/gdm/greeter.gsettings
In the terminal, you can get READ access to this file by typing:
nano /etc/gdm/greeter.gsettings
You'll see in that file a reference to: /usr/share/themes/Adwaita/backgrounds
which appears to hold the stripe backgrounds you're looking for. Good luck!
Remember, you'll need to elevate using sudo to write to this directory. Or if you would rather use the graphical interface, you can type this in the terminal to open up gedit as an elevated user, but be careful not to wreck your system:
gksudo gedit /etc/gdm/greeter.gsettings
I use gdm-tools:
sudo apt install libglib2.0-dev dconf-cli
git clone --depth=1 --single-branch https://github.com/realmazharhussain/gdm-tools.git
cd gdm-tools
./install.sh
set-gdm-theme -s default ~/Pictures/gdm_wallpaper.png
Login Manager Settings: https://flathub.org/apps/io.github.realmazharhussain.GdmSettings
