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I think I had the same problem with the ATHEN USB serial cable. Here is how I solved it:

Add the following line in the /etc/udev/rules.d/52-turtlebot.rules:

ATTRS{idProduct}=="2008",ATTRS{idVendor}=="0557",MODE="666",GROUP="turtlebot"

2008 and 0557 is either the vendor or product id. You can find that out from lsusb. The problem is that the ttyUSB0 does not have the approprite permission.