Uninstall
It is recommended that you revert back to your previous GDM login theme and wallpaper prior to uninstalling the packages.
Run the following command to remove the packages:
sudo apt-get remove \ ubuntu-satanic \ ubuntu-satanic-wide \ satanic-wallpapers \ satanic-wallpapers-wide \ satanic-gdm-themes \ satanic-gnome-themes \ satanic-icon-themes \ satanic-sounds \ usplash-theme-satanic \ eternal-damnation \ gtk2-engines-aurora
If the standard Ubuntu usplash screen doesn't appear after a reboot, run the following commands:
sudo update-alternatives --set usplash-artwork.so \ /usr/lib/usplash/usplash-theme-ubuntu.so sudo update-initramfs -u

