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 \ satanic-plymouth-theme \ eternal-damnation \ gtk2-engines-aurora
If the standard Ubuntu boot screen doesn't appear after a reboot, run the following commands:
sudo update-alternatives --set default.plymouth /lib/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth sudo update-initramfs -u

