[Samba] Samba and Ubuntu 9.10

[Mario Salcedo]

Hi. I have a problem with Samba in Ubuntu 9.10. In the last year I
configure a Samba Server in Centos 5.2 for a school, all ok. In this
year I did the same but in Ubuntu 9.10, but dont work. The students
connect the Samba Server, but when they create documents the Samba
Server disconnect them. After a time automatic they connect and
disconnect again. The process is continue, connect and disconnect. I'd
revised problem of red, permissions files, the fiel smb.conf but
nothing.
 My configuration is ok. I compare with Centos.

Any ideas.