After updating netcfg, the following services did not start anymore:
  postfix
  nscd
  autofs
  ypbind
  ntpd
and sddm only shows a black login screen.

The cause of the problems is the move of file /etc/services to /usr/etc.

I added a symlink (ln -s /usr/etc/services /etc) to see what will happen and
after a reboot most services worked again except nscd and ntpd.

If instead of the symlink a copy the file (rm /etc/services ; cp
/usr/etc/services /etc) then after the reboot everything works again.