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# How to change the GDM theme
To change the GDM (lock/login screen) theme, you need to replace the system's _default_ GNOME Shell theme.
## :warning: Cautions :warning:
- If the replacement fails, your desktop environment will not work properly. So please **be careful** if doing this.
- When applying this, other third-party GNOME Shell themes would look broken until you restore to the original theme.
- If GNOME Shell has been updated and restored to the original theme, you will need to install this again.
> Note: On Arch Linux, you can automatically reinstall the GDM theme by creating a [hook](https://wiki.archlinux.org/index.php/Pacman#Hooks) file. For example, if you use Material-Black-Lime as your GDM theme, put [this file](https://gist.github.com/looselyrigorous/a1aa931ce48627cc39daccc9253b30c7) in the `/usr/share/libalpm/hooks/` directory.
## Requirements
- `glib-compile-resources` — The package name depends on the distro.
- `glib2` (Arch Linux)
- `glib2-devel` (Fedora, openSUSE, etc.)
- `libglib2.0-dev` (Debian, Ubuntu, etc.)
- `libxml2-utils` — Ubuntu users only.
## Installation
1. **Back up** the original theme file(s) first. If you are already using a custom GDM theme, skip this:
```sh
sudo cp -av /usr/share/gnome-shell/gnome-shell-theme.gresource{,~}
# For Ubuntu 17.10 or 18.04, you also need the following:
sudo cp -av /usr/share/gnome-shell/theme/ubuntu.css{,~}
# For Ubuntu 18.10, you also need the following:
sudo cp -av /usr/share/gnome-shell/theme/Yaru/gnome-shell.css{,~}
```
2. Select a **GTK** theme to decide which variant to install.
3. Replace the default theme file(s):
```sh
GTK_THEME=$(gsettings get org.gnome.desktop.interface gtk-theme | sed "s/'//g")
cd /usr/share/themes/${GTK_THEME}/gnome-shell
sudo glib-compile-resources --target=/usr/share/gnome-shell/gnome-shell-theme.gresource gnome-shell-theme.gresource.xml
# For Ubuntu 17.10 or 18.04, you also need the following:
sudo cp -av gnome-shell.css /usr/share/gnome-shell/theme/ubuntu.css
# For Ubuntu 18.10, you also need the following:
sudo cp -av gnome-shell.css /usr/share/gnome-shell/theme/Yaru/gnome-shell.css
```
4. Reload the theme. If you are running GNOME Shell, press <kbd>Alt</kbd> + <kbd>F2</kbd> then type `rt`.
## Uninstallation
1. Restore to the original theme file(s) from the backup:
```sh
sudo mv -v /usr/share/gnome-shell/gnome-shell-theme.gresource{~,}
# For Ubuntu 17.10 or 18.04, you also need the following:
sudo mv -v /usr/share/gnome-shell/theme/ubuntu.css{~,}
# For Ubuntu 18.10, you also need the following:
sudo mv -v /usr/share/gnome-shell/theme/Yaru/gnome-shell.css{~,}
```
2. Reload the theme. If you are running GNOME Shell, press <kbd>Alt</kbd> + <kbd>F2</kbd> then type `rt`.
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