Hey, thanks for your report. How did you install the hello-world snap? What is the output of snap version ? And could you put the seccomp file somewhere please, the file is located in /var/lib/snapd/seccomp/bpf/snap.hello*.{bin,src}.
emailing anything wont help. your kernel simply does not have the right features enabled (looks like it is simply the raspberry-pi foundation kernel). you would need to use the linux-raspi2 kernel package from the ubuntu archive …