Wednesday, June 29, 2022

Changing ubuntu background image

 





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:

1. Extract the gnome-shell-theme bianry

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

2. Edit gnome-shell-theme.gresource.xml and gnome-shell.css (section #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.

3. Then again compile it

Finally, compile the theme using the following command:

glib-compile-resources gnome-shell-theme.gresource.xml

4. Copy the compiled gnome-shell-theme file

And copy the resulting gnome-shell-theme.gresource-file to the /usr/share/gnome-shell directory.

5. Restart gdm or logout

Eventually restart gdm or just logout.

Finished!




source: https://askubuntu.com/questions/202129/how-i-can-change-the-gdm-login-screen-wallpaper

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