The link I put up is https://forum.linuxcnc.org/9-install...int-iso#165631 the RT version with Mint with linuxcnc and wifi support and is simple to upgrade .
In a terminal type
sudo apt-get update
then
sudo apt-get dist-upgrade
will get you the latest packages
If you want the official version :- http://www.linuxcnc.org/iso/linuxcnc-2.8.0-buster.iso The Debian 10 Buster ISO uses a PREEMPT-RT patch
But in my opinion the mint one is a lot more user friendly.