Hi @HarryL
Thank you very much for the instructions I am now up and running with a smile on my face 
I took a fresh install and tried your instructions but it all failed. I then installed the App Store version and then immediately uninstalled it and your instructions then worked
I have a PCTV 292e USB tuner and when I tried to use it Tvheadend could see it but it would’t find any services. When I looked at DMESG I saw that dvb-demod-si2168-02.fw was not being loaded. I discovered that it was not in /lib/firmware so I downloaded it and put it in the folder and the tuner burst into life.
Thank you again for the instructions
Keith