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  1. When you are starting a roscore on A, you will only have to export your ROS_MASTER_URI on B and set it to the IP-adress of A

  2. Your second problem is related to Ubuntu/Bash. Every time you start a new terminal, the .bashrc is sourced (which usually is located in your home). By default ROS installation, it loads the setup.bash in your /opt/ros/electric/ folder which sets your ROS_MASTER_URI to localhost.