tools->serial port grayed out

I have linux mint and i have downloaded the IDE from synaptic i have done all the stuff it said about adding dialout privileges and logged out and back in and rebooted. if i open a terminal and run groups it says i have dialout. i have done the chmod command as well. again with logging out and back in and rebooting.

i have looked on several pages and the final suggestion is always make sure the port is set to dev/tty/USB0 which i would if the menu option wasn't greyed out

any suggestions please coop

Make sure the USB cable is fully inserted into your Arduino board and the computer.

You might have a damaged, defective, or charge-only USB cable. Try it with a different cable.