Arduino Nano Connection Problem - dialout group

in IDE:

select: Tools -> Board -> Arduino Nano
select: Tools -> Processor -> ATmega328P (Old Bootloader)

select: Tools -> Serial Monitor
"Error opening serial port '/dev/ttyUSB0'. Try consulting the documentation at http://playground.arduino.cc/Linux/All#Permission"

select: Tools -> Port
lists: /dev/ttyUSB0

$ ls -l /dev/ttyUSB* or ls -l /dev/ttyACM*
shows that the port is owned by root and has owner (?) dialout

However:
$ id jay
shows I'm not a member of the dialout group

join the group with:
$ sudo usermod -a -G [groupname] [username]
$ sudo usermod -a -G dialout jay