Hi Lars
I understand that you connect your mount with EQDIRECT cable to Raspberry Pi. Just to be sure, you are connecting it directly and you don't use synscan hand controller, right? And you use EQMod Mount driver, right?
It seems that another device is claiming /dev/ttyUSB0 port used by EQMod Mount driver. You need to identify which one it is. Disconnect all devices and connect only the mount, then connect other devices one by one and observe the logs.
GPSD is a generic, system wide service providing location to various system components. It can use various sources of location data, namely a gps receiver connected locally (most often as a serial device), gps receiver over network (eg. from your mobile) or virtualgps provided by Astroberry (static location configured in /etc/location.conf). Make sure that you don't set gpsd config to use the same serial port as your mount as this would cause problems. Leave gpsd configuration default in /etc/default/gps unless you know what you're doing. If your gps is connected to USB, it should be automatically picked by gpsd service. If using real gps, disable virtualgps service.

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