Samba set up error

[Jim Christiansen]

I have an error of:

jim at jim-desktop:~$ sudo net groupmap add ntgroup="Domain Admins"
unixgroup=sysadmin rid=512 type=d
Can't lookup UNIX group sysadmin

When following the guide at:

https://help.ubuntu.com/9.04/serverguide/C/samba-dc.html

Anyone have an idea on this?  It is pretty much the last line of the read-me
for setting up a pdc...

Thanks,  Jim
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