I have APM Planner 2.0.18 installed from this link here. I couldn't install the latest versions due to errors and was suggested to try a different one bu @LanderU. Also, I have connected the ERLE Brain 2 using Ethernet and now the APM Planner is detecting it correctly.
However, when I try to calibrate the accelerometer, I get the screen below and I don't know what to do from here on. I saw another post that talked about a similar error. I have tried to install several different versions of the APM 2 on my Ubuntu 14.04 64-bit but this was the only one (2.0.18) that seems to get setup on the system.
Is there some way to get the calibration done by overcoming this error?