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"