installation for MDBT42Q

After doing some searching in the web, BTW I'm working with ubuntu 18.04.4 LTS
Actual nrfutil version is 6, but with that I get errors around installing pc-ble-driver

Figured out, that nrfutil V 5.22 can be installed.
Actual installation according to pip list is

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nrfutil (5.2.0)
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pc-ble-driver-py (0.11.4)
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....

I've got an error and somewhere I found to do this

export LC_ALL=C.UTF-8
export LANG=C.UTF-8

But now I'm running into problems inside py-sources.
Sometimes life is not as friendly as it could be ;-(