Same thing happening for my OPi PC2 after latest update (5.27.170602)
Edit:
chmod: changing permissions of '/etc/update-motd.d/10-header': Operation not permitted
chmod: changing permissions of '/etc/update-motd.d/30-sysinfo': Operation not permitted
chmod: changing permissions of '/etc/update-motd.d/35-tips': Operation not permitted
chmod: changing permissions of '/etc/update-motd.d/40-updates': Operation not permitted
chmod: changing permissions of '/etc/update-motd.d/41-armbian-config': Operation not permitted
chmod: changing permissions of '/etc/update-motd.d/98-autoreboot-warn': Operation not permitted
chmod: changing permissions of '/etc/update-motd.d/99-point-to-faq': Operation not permitted
Same errors after sudo chmod +x /etc/update-motd.d/*
