If you wish to print (or see) a preview of your installed fonts under linux. I found this command myself:
Here is the All-in-One command, copy and paste all this in a terminal (Applications > Accessories > Terminal):
(echo '<html><body>' && (fc-list | sed 's/\(.*\):.*/<font face="\1">\1<\/font><br>/') && echo '</body></html>') > fonts.html firefox fonts.html
Then Hit Enter.
This should open firefox and open fonts.html, by itself.
Otherwise, go to your user’s directory and open fonts.html yourself.