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So I am posting this to help someone else who might run into this problem.
When following the guide I would get to the point I wanted to run the proxmark.
Dmesg|grep -i usb
confirm its ttyACM0
Then
cd client
./proxmark3 /dev/ttyACM0
and I get ERROR: invalid serial port
Try adding a ***SUDO***
sudo ./proxmark3 /dev/ttyACM0
what a stupid problem to have.