[chirp_users] USB Error using Ubuntu Mate

I'm using Ubuntu Mate on my laptop to run chirp. I keep getting an error: “Errno could not open serial port /dev/ttyUSB0. Errno permission denied /dev/ttyUSB0”

I can open a terminal and type in "sudo chmod 777 /dev/ttyUSB0" and it solves the issues for that session. But, the next time I boot up the laptop, I have to plug in the cable, then go to the terminal and re-do the chmod command. Is there a way to get that to stick permanently?

Thanks!

Monte