Plymouth just shows symbols instead of boot animation in Debian Buster

# ASK: How can I properly configure my Plymouth Boot Screen? - I have Debian Buster 10.4 **XFCE**. - I set quiet and splash boot parameters in my grub. - sudo plymouth --show-splash doesn't work. - At shutdown, Plymouth just doesn't appear. - At startup, Plymouth is shown as a strange colored screen that doesn't fit my screen resolution. That screen has three blocks of text (square symbols) blinking with the common loading pattern (**X**XX - X**X**X - XX**X** - **X**XX - etc) - I did try to change the Plymouth Theme without success. It is to note that I have the NVIDIA Proprietary Drivers installed on my system, but the official configuration of the Debian Wiki just shows the below way for the /etc/initramfs-tools/modules: > For **Nouveau** (nVidia) > > # KMS > drm > nouveau modeset=1