[PROBLEM] wpa_suplicant not started automatically

[quaelgeist]

I am facing the same issue on 6.4.2 2020-02-12
I am using a raspberry pi 2 and an WIFI USB Dongle which is working fine on every other Rasbian-based system on the very same pi so far.

I followed (https://github.com/moode-player/moode/bl.../setup.txt)

Code:

1. CONFIGURE FOR WIFI CONNECTION   
  - Ethernet mode
   a) Leave eth cable connected
   b) Insert wifi adapter (while Pi running)
   c) http://moode
   d) Menu, Configure, Network
   e) Configure a wifi connection
   f) Menu, Restart, Shutdown
   g) Unplug eth cable
   h) Power on

Without success. 
I am able to find my own wifi (step d) and was entering the correct key.
Restarting the Pi will not automatically connect to my wifi, most likely due the issue with wpa_supplicant.