[Samba] Ubuntu clients can acces to the [homes] share

[Toro]

Hi,

I have a server with Debian Lenny, and I installed samba on it. I do two
shares, one, a normal folder with auth, and this share worjs fine in all the
computers (Windows XP and Ubuntu Karmic). But the [homes] share only works
in the XP machines.
When I try to acces to the [homes] share from a ubuntu machine, I can't
authenticate, I mean, the auth box don't appear.

¿Anyone know why?