found solution :

cd ~/git/vthoang/cgminer/

sudo usermod -G plugdev -a `whoami`

sudo cp 01-cgminer.rules /etc/udev/rules.d/

sudo reboot

from here :  https://www.eyeboot.com/download/GekkoScience_2PAC_BM1384_USB_Stick_Miner/2PAC_BM1384_USB_Setup_Guide.pdf

its written badly , so you have to tweek as all joined

it is a real shame that both bitcoin forum and bitshopper.de have inadequate instructions on both 2pac and moonlander 2.  have had to find other ways to set up.  sloppy work by the big guys.