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I think the problem is the dev you are using, you should use ttyUSB0 instead of ttyACM0, the ttyACM0 is not the FTDI port for Linux console, it is for using it with the Arduino IDE.
Try with: sudo screen /dev/ttyUSB0 115200
Thank you! For clarification (and maybe it will help other newbs) I did not have the correct USB plugged in. Plugging in the middle USB gives power and allows you to flash the board but it connects as ACM0, not as USB0. You need to connect the USB closest to the edge of the board to get a FTDI port. The command 'lsusb' will tell you if you have a USB-serial (UART) USB connection.