(superseeded) Linuxcnc on Linux Mint 19.3 quick and easy installation

I apologize, I cound linuxcnc, I just searched linuxcnc in the menu search bar and realized that it opens to favorits, and needs to be set to all programs.

Ok another question. I found the linuxcnc tried doing a pnc.config and it said
You have no hostmot2 firmware downloaded in folder:
/lib/firmware/hm2/
PNCconf will use internal firmware data

I tried finding hostmot2 in the package manager and its not there. so i need to know where to find the hostmot2 package and how to install it.
Any ideas?

That is just a warning and can be safely ignored, no need for it except if using older Mesa boards.

an attempt to add a repository "sudo apt-add-repository 'deb buildbot.linuxcnc.org/ buster 2.8-rtpreempt'" gives an error: Repository already exists.
all suggested keys have been tried((

daiman444 wrote:

..... gives an error: Repository already exists.

Move on to installing LinuxCNC.

I did not succeed with Mint 20

But worked fine with 19.3

Many thanks for this useful thread

Philip