Hi!,
I'm not an expert at all, but as stated in raspberrypi.stackexchange.com/a/46933 to be able to issue the command
sudo apt-add-repository ppa:mutlaqja/ppa
inside Raspbian, you need to install the packege software-properties-common beforehand with
sudo apt-get install software-properties-common

Hope it's not too late

May I ask you how did you connect the Servocat / Nexus DSC setup with ekos?
I've been reading and it sems like Nexus DSC is comptible with LX200 protocol, but I'm planning on upgrading my setup and would like to double check for indi compatibility.

Thx in advance

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