I hope this explanation clarify the problem.
You need set in
apm.sh the ip address of the device that you need to be connected.
In our case, the Erle-Brain has the 10.0.0.1 ip, in my computer(that has the GCS) in order to connect to that drone, we've set the 10.0.0.2 ip. This ip 10.0.0.2 is the ip that you need set in your
In your case, if your Ubuntu Mate (that has the GCS installed), if he has the 192.168.1.50 ip, you need set this ip in your