Job for icinga2.service failed. See 'systemctl status icinga2.service' and 'journalctl -xn' for details. invoke-rc.d: initscript icinga2, action "start" failed. Jan 26 15:16:01 pi1 prepare-dirs: Could not fetch RunAsUser variable. Error ''. Exiting.
When running the icinga2 binary directly I got
Turns out Raspbian’s armhf is not quite armhf. Luckily I had a Raspberry Pi 2 available and with the help of rpi23-gen-image I could create a Jessie image and install icinga2.