The boot options: ssh, fstab and and vnc server setup work only correctly when
the standard user grml is used. In addition the fstab entries uses default
strings from target:/etc/grml/autoconfig without check.

-- 1ST. PROBLEM ------------------------------------------------------
see from boot log:

-> * Bootoption ssh found, trying to set password for user grml.
-> chpasswd: line 1 user 'grml' does not exists
-> chpasswd: error detected changes ignored

-- 2ND. PROBLEM ------------------------------------------------------
press x to start local x server

-> Running Command su grml -c grml-x
-> Unkown id: grml

X-Server does not start up, :-(

-- 3RD. PROBLEM ------------------------------------------------------
VNC Server setup uses hard coded 'grml' user -> found by code inspection

-- 4TH. ADVICE -------------------------------------------------------
fstab ownership should be configured as follows:
a.) /etc/autoconfig:$CONFIG_FSTAB_USER ( multi user system )
b.) standard user with id:1000         ( for single user system )
c.) standard user with name=grml       ( for single user system )
d.) fallback to root, to avoid bad fstab

-- USED CONFIG -----------------------------------------------------

[ grml-live.local ]:
OUTPUT="/opt/develop/grml/grml-live"
CLASSES="GRMLBASE,GRML_FULL,AMD64"
DEFAULT_BOOTOPTIONS="ssh=grml-ssh-secret startx vnc=grml-vnc-secret"
USERNAME=myuser

[ ISO-Setup ]:
grml-live [0.17.3]: check your configuration (or use -F to force execution):

  FAI classes:       GRMLBASE,GRML_FULL,AMD64
  Configuration:     /etc/grml/grml-live.local
  Config directory:  /etc/grml/fai
  main directory:    /opt/develop/grml/grml-live
  Chroot target:     /opt/develop/grml/grml-live/grml_chroot
  Build target:      /opt/develop/grml/grml-live/grml_cd
  ISO target:        /opt/develop/grml/grml-live/grml_isos
  Grml name:         grml
  Release name:      grml rocks
  Build date:        2012-01-12
  Grml version:      0.0-1
  Debian suite:      testing
  Architecture:      amd64
  Boot method:       isolinux
  Hybrid method:     isohybrid
  Template files:    /usr/share/grml-live/templates
  Boot identifier:   grml-mybootid
  Adding default bootoptions: "ssh=grml-ssh-secret, persistent"
  Using SQUASHFS_OPTIONS -b 256k

see appended file for git-patch: