[Samba] Why I cannot delete a user ?

[Kevin Wilson]

Hello,
I am using Fedora 20. I had installed
samba-client-4.1.6-1.fc20.x86_64 on a Fedora machine (this package was
not installed previously on this machine).
I added one user, root, by:
smbpasswd -a root
New SMB password:
Retype new SMB password:
Added user root.
I can see this user by:

[~]#pdbedit -L
root:0:root

Now, when I try to delete that user, I get an error:

smbpasswd -x root
Failed to delete entry for user root.

Any ideas why is it so? It seems like a bug.

Regards,
Kevin