Bought two standard units.  I'm a linux amateur, probably should have bought a full unit.  Have been able to configure start_apollo.sh file and get one miner running.  Connected to a hackintosh running ubuntu.  I cannot figure out how to get second miner running.

./miner_start_all.sh returns "line 8: screen: command not found" two times, then says "Started."  Yet I can't see the worker in the pool, and red light stays solid.  How do I get the second miner running?  How do I open a second instance? 

Appreciate any advice, but please talk slow for the dummy. 

Also, was hoping to run each miner via its own rpi, but cannot find a way to run a stable 64-bit os on the rpis to install the 64-bit apollo software.  Is 32-bit coming?  Any suggestions for running these via rpi?  Appreciate the help.  Learning as I go but I have to start somewhere.

Thanks.