Thanks Giner, worked for me first time on Ubuntu MATE 18.04 LTS.
Although I did remove the disable CD-ROM, as I dont want people messing with my source.list and I also knocked out the adding universe as its already active.
You might want to consider joining Discord and the Savage XR channel as there is more development talk over there than on this forum these days.
Drk is beavering away finalizing the 64-bit release version of Savage... XR - 64! Which hopefully will make installation a lot less painful.
When I get the chance I'll try your script on Debian 10, should work.