Can't use smbpasswd in Ubuntu 10.04

Question

When I try to run smbpasswd this is what I get:

cli_pipe_validate_current_pdu: RPC fault code DCERPC_FAULT_OP_RNG_ERROR received from host 127.0.0.1!
machine 127.0.0.1 rejected the password change: Error was : NT code 0x1c010002.

I'm using samba4. To use smbpasswd I just typed "smbpasswd" and pressed enter. There are no other machines involved. I have virtual machines in my system which I am trying to get to accesss files on this computer, but I don't think that counts.

Answer 1

It would help if potential viewers of this request knew:

Which version of samba are you using?
What command did you give it that generated this error message?
Is there more than one machine involved?

Added:
You might initially at least need to execute smbpasswd as root, but I usually do this as follows:

$ sudo sh

(switch to superuser shell)

# smbpasswd -a username_one

(smbpasswd will prompt for password for user one)

# smbpasswd -a username_two

(smbpasswd will prompt for password for user two)

# exit

(superuser shell exits)

Once the smbpassword file is set up and populated then you can let regular users change their password

$ smbpasswd

(smbpassword prompts for old password, then new password)

Answer 2

Try executing as root:

$ sudo smbpasswd

If that doesn't work, please post the contents of /etc/samba/smb.conf