for anyone that wants to try on their own: erroneously I used ubuntu rather than debian in one place, and therefore it did not work. The full sequence is apt-get update && apt-get -y install apt-transport-https gnupg wget net-tools wget -O - https://apt.van-belle.nl/louis-van-belle.gpg-key.asc | apt-key add - echo "deb https://apt.van-belle.nl/debian bionic-samba410 main contrib non-free" | tee -a /etc/apt/sources.list.d/van-belle.list apt-get update && apt-get install -y samba samba -V Thanks to Louis! Joachim