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You could check the permissions of ttyUSB0

ls -la /dev/

If the perms are not 666 or a+rw then you need to boot with usb that has permission to access. Basically you need to create a new rule in /etc/udev/rules.d:

Create a new file with your specific permissions (higher numbers override existing rules):

cd /etc/udev/rules.d/
touch 80-turtlebot.rules
sudo pico 80-turtlebot.rules

Add the following lines for every usb device:

#serial usb
SUBSYSTEM=="usb", ATTRS{idProduct}=="6001", ATTRS{idVendor}=="0403", MODE="0666", GROUP="turtlebot"

To find the product id and vendor id, do lsusb -v, I think if you just do regular lsusb its vendor:product. Shift + PgUp to view previous parts of the cli.

finally reboot

sudo reboot