Thanks tommylight, I will rebuild from scratch.
The installation from CD has some issues. This is the CD
Debian GNU/Linux 9.8.0 "Stretch" - Official i386 xfce-CD Binary-1 20190216-12:51
1) After log-in as userName and setting userName as a member of sudo the instruction sudo was not found.
2) Log-in as root with rootPW if set. I always set it!
Code:
su root
rootPW
adduser userName sudo
# Install the sudo executable
apt install sudo
su userName
# Now sudo works but breaks Thunar's ability to view exfat USB drives
# Correct the issue with exfat USB drives
sudo apt-get install exfat-fuse exfat-utils
# Install key for buildbot
sudo apt-key adv --keyserver hkp://keys.gnupg.net --recv-key EF1B07FEE0EE663E
# Add the following to for the Synaptic Package Manager
echo deb http://buildbot.linux.org/ stretch 2.8-rtpreempt >>/etc/apt/sources.list
echo deb-src http://buildbot.linux.org/ stretch 2.8-rtpreempt >>/etc/apt/sources.list
# You should now be able to download the 2.8 version of LinuxCNC without errors
Very nice work you guys!