LTSP how to change client's default password ?

OpenSUSE 11.0, Easy-LTSP, default prebuild image…

testsrv:~ # uname -a
Linux testsrv #1 SMP 2008-10-21 16:30:26 +0200 i686 i686 i386 GNU/Linux
testsrv:~ # mount -o loop,rw /srv/kiwi-ltsp/ltsp-suse-11.0.i686-0.0.1 /mnt
testsrv:~ # chroot /mnt
testsrv:/> /usr/bin/passwd
Changing password for root.
New Password:
Reenter New Password:
Cannot lock password file: already locked.
Error: Password NOT changed.
passwd: Authentication token lock busy
testsrv:/> passwd -u root
Cannot unlock the password for `root’!

Except this :wink: Really Great !!!