Thin client problem

[Phyo W. Soe]

Hi all,

I am a newbie to Ubuntu and I am trying to boot up a thin client using 
PXE and ltsp. Using Edubuntu 6.10 on the server, I set up the dhcp and 
tftp servers and make the tftp boot dir to be /opt/ltsp. When I switched 
on the client, it got an IP address (I tried both static and dynamic 
addresses) and vmlinuz and initrd loaded into the memory. That booting 
process goes on and I see messages like "EISA: Probing bus 0 at eisa.0" 
and "Using IPI Shortcut mode" along the process. After those, I see
________________________________________
...
Begin: loading essential drivers ... ...
[...] Capability LSM initialized
Done
Begin: Running /scripts/init-premount ...
....
Done.
Begin: Mounting root file system ... ...
/init: init:125: divide by zero
[...] Kernel panic - not syncing: Attempted to kill init!
__________________________________________
and then the client hangs and I have to pull out the power cable to 
restart it. I tried with a real thin client and a fat client with PXE 
enabled and got same results. I tried modifying/adding some parameters 
in lts.conf (as well as running with the original lts.conf) but it 
didn't make any difference. I also tried different config options for 
pxelinux.cfg/default file under. My current pxelinux.cfg/default file 
looks like this: (my tftp boot dir is /opt/ltsp)
___________
DEFAULT Ubuntu
label Ubuntu
    kernel i386/boot/vmlinuz
   append init=i386/usr/share/discover/linuxrc rw root=i386/dev/ram 
initrd=i386/boot/initrd.img
   prompt 1
   timeout 20
___________
My current lts.conf looks like this:

[default]
    SERVER=192.168.0.254
    X_MOUSE_PROTOCOL="PS/2"
    X_MOUSE_DEVICE="/dev/psaux"
    X_COLOR_DEPTH=16
    XkbLayout="us"
    RUNLEVEL=5
    LOCALDEV=True
    SOUND=N
    NBD_SWAP=True
    SYSLOG_HOST=SERVER
--------------------------------------------------------------------------------------------

Do any of you have any idea where that error "/init: init:125: divide by 
zero" comes from? I don't know why the root system mounting failed.

Thanks for any help.