ADB Have No Permissions on Linux (Debian Variants)

When you run "$adb device", and the result like this:

List of devices attached 
????????????    no permissions

Try to restart the Adb server.

sudo adb kill-server

and then

sudo adb start-server

then connect your device turn Debugging on and type

adb devices

ref : https://askubuntu.com/questions/908306/adb-no-permissions-on-ubuntu-17-04