I confirmed with Xubuntu 18.04LTS.

Original docs.: https://github.com/dbason/crystalhd/edit/master/README.md

Requiremets

sudo apt-get install checkinstall
 git
 autoconf
 pbuilder 
 dh-make 
 quilt 
 git-buildpackage 
 yasm 
 zlib1g-dev 
 libzip-dev 
 libx11-dev 
 libxv-dev 
 vstream-client-dev 
 libgtk2.0-dev 
 libpulse-dev 
 libxxf86dga-dev 
 python-appindicator 
 libelf-dev

Installation

git clone https://github.com/dbason/crystalhd.git

cd crystalhd/driver/linux
autoconf
./configure
make -j2
sudo make install


cd ../../linux_lib/libcrystalhd/
make -j2
sudo make install 
sudo modprobe crystalhd
lsmod
dmesg | grep crystalhd

After kernel update

Reinstall the driver.

cd crystalhd/driver/linux
sudo make install