Render group keeps getting assigned to random groups instead of render for HW acceleration. Using a bash script in systemd corrects it. Wasn't sure if adding the chgrp in your install.sh would prevent the need for the bash script.
#! /bin/bash
chgrp render /dev/dri/renderD128
* improve error handling to show more details
* improve the way it checks for root password
* consistant getty_override
* streamline verbose mode
* remove v4 scripts
* small tweaks