FP3 with ubuntu touch does not connect to desktop via USB

I decided to install Ubuntu Touch on my FP3+ and used the UBPorts installer for this.
After two days of testing (without SIM) I am really amazed by the performance and low energy consumption.
However, there is an important question left. I hope, we have here a community of active Ubuntu Touch users that can help me.

I activated developer mode, however adb does not see any device. I did not find a place, where I could enable USB debugging. As well the internal SD does not connect to my desktop with cable connected.
It should neither be an issue with the cable nor with the adb. Both were used before and worked perfect until ubuntu touch was installed. When I manually switch to recovery adb and SD connect do as well not work. When I manually switch to bootloader however, fastboot shows a device.
What is going wrong here? Btw, I use Linux an my desktop. Perhaps, this is a missing driver issue?
Regards
Frytz

Found an answer to my question here.
https://docs.ubports.com/en/latest/userguide/advanceduse/adb.html
It only refers to FP2. Gave it a try, and it worked

printf "0x2ae5 \n" >> ~/.android/adb_usb.ini
adb kill-server

Solved SD card access as well.

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