I searched several sites seeking information. I just want to report what I found worked very well.
First I have just upgraded to Mint 17.3 (Rosa) Of course I wiped out some of the material that I could not find in my back up disc.
I found this site:
http://members.apex-internet.com/sa/...ontmatrix.html
Where I found this comment: It requires these packages: autotrace-0, fontforge-2008.
Well, searching the package manager I could not find these packages, but I did find "FONT MANAGER" which I installed.
Now in font manager it has an option in the very bottom to "Manage Fonts" Open the little Gear/star Icon and there you have an option to install fonts.
As I had already a copy of the new font in my home folder, I just directed the manager to my home page and selected the required folder.
Click on each font, choose reload later, if you have more than one font. When all fonts are selected run the reload now and your fonts are installed.
I hope this helps someone in the future.