Edubuntu 11.10: Unity menu don't show in thin client

[Zied ALAYA]

Hi,
our loco team is currently leading a migration project in many schools.
we want to use old machines with a good edubuntu server.

Actually we have faced a little problem. After installing Edubuntu 
11.10, thin client can boot but the Unity menu don't show !

So students don't have a menu application.

Any idea please ?

Regards
Zied ALAYA