@MarekBelisko Thanks, below is the section of the documentation I’m referring to:
https://docs.mender.io/1.7/devices/debian-family
I have also checked the requirements / general requirements, it seems that Mender or mender-convert do only officially support BeagleBoard and Raspberry Pi.
Does anybody know if x86 + Ubuntu Server can be used? I’ve seen at least one “Intel x86 NUC” thread here but so far I cannot make any sense out of it (I guess it was not using Ubuntu).