RPi4+Navio2 with Ubuntu 20.04 and ROS Noetic

Hello. I have Raspberry Pi 4 with Navio2. I should use Ubuntu Server 20.04, because Intel Realsense isn’t worked on Raspbian OS. I want to install PK4 to Ubuntu, but actually I don’t what should I do.

  1. I have done instruction on native build for Navio2. But I couldn’t execute make emlid_navio2_native. It wrote me Makefile:496: *** "Make target emlid_navio2_native not found. It either does not exist or emlid_navio2_native cannot be the first argument. Use 'make help|list_config_targets' to get a list of all possible [configuration] targets.". Stop.
  2. Also I have tried to install using Raspberry Pi istruction. But I could gcc-8-aarch64-linux-gnu g++-8-aarch64-linux-gnu. I tried to use clang build, but it wrote me


  is not a full path and was not found in the PATH.

I installed MAVROS, but I can’t install PX4 for this. What I do wrong? Thanks.