Really? starting services properly is that hard

I reaaaaally don't care if it's Raspbian or Debian screwing up the startup of nfs-kernel-server, it should have been fixed long ago.

And there are endless posts on debian raspbian and other forums about this, many with fixes that only work in very specific (unstated) circumstances.

In the end I just got out me Glasgow screwdriver and
stuck a new line in crontab to postfix the mess.

sudo crontab -e

and add the line

@reboot              sleep 5 ; /usr/sbin/service rpcbind start ; sleep 10 ; /usr/sbin/service nfs-kernel-server restart