Linux adb HOWTO needed

Hello,

i cant get LG G5 European adb mode working under Ubuntu.
I Have newest adb 1.0.32 installed and a 51.android-tules with the line # LG
SUBSYSTEM=="usb", ATTR{idVendor}=="1004", MODE="0666", GROUP="plugdev".
chmod a+r is done.
USB 2.0 connected instead of usb 3.0.
ried also mtp and ptp mode.
What I am missing?

thanks...
joalupo