Comment 4 for bug 306168

Once winbind is removed you should not get the idmap errors in your logs anymore. Those were related to a half-configured winbind server on your Ubuntu client. However your problem is not solved yet, we just removed noise.

What command or action are you doing to access your Samba share ? Are you using nautilus ? Using a cifs/smbfs mount command or /etc/fstab ? Using smbclient ? How does it "crash" ? Any error ?