Ubuntu usb serial ports

create the file /etc/udev/rules.d/99-arduino.rules with roor:root owner, if not exists
remove your usb device
run script lsusb >/tmp/lsusb.1 ; read -p "Insert usb device and press enter" ; lsusb >/tmp/lsusb.2 ; diff /tmp/lsusb.1 /tmp/lsusb.2
press eneter and use XXXX:YYYY pair for next step
add SUBSYSTEMS=="usb", ATTRS{idVendor}=="XXXX", ATTRS{idProduct}=="YYYY", MODE="0660", GROUP="dialout"
repeat for all other devices
then reload rules udevadm control -R
check if user exists in dialout group grep dialout /etc/group
if not add to it usermod -a -G dialout <yourUserName> - AFTER ADD IT NEEDS REBOOT or change to GROUP="your name"

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