Comment 12 for bug 16575

I experience this in Kubuntu Feisty (AMD64). Also, I noticed that I cannot click the Apply button after I add a user in this dialog. Go to the Advanced tab and look at the Security options. From there, click on the Password tab. You'll see a box for "SMB passwd file" that points to /etc/samba/smbpasswd, but that file does not exist. I tried creating the file there to see if that would help, but nothing happens. I then tried using smbpasswd from the console to add a user with "smbpasswd -a [user]", but still nothing shows up in that file or in the KControl dialog (though I could be using the command line tool incorrectly).