Comment 16 for bug 16575

I Confirm this.

This is very old bug, and it is related to the fact that the above panel looks at smbpasswd file
which isn't present anymore on newer samba.

It is possible to make samba use smbpasswd file, but it doesn't worth the hassle since
even then this panel just shows the current users, but still doesn't add them corectly

Just use sudo smbpasswd -a username