Problem in changing password

[mostafa]

Jacques B. wrote:
> On 10/9/07, Frank Cox <theatre at sasktel.net> wrote:
>   
>> On Tue, 09 Oct 2007 16:24:51 +0200
>> mostafa <mostafaradwan at gmail.com> wrote:
>>
>>     
>>> passwd: User not known to the underlying authentication module
>>>       
>
> Did you check out
> http://www.linuxquestions.org/questions/linux-general-1/passwd-user-not-known-to-the-underlying-authentication-module-83380/
>
> or
> http://lists.alioth.debian.org/pipermail/debian-live-devel/2006-May/000249.html
>
> or
>
> http://www.wains.be/index.php/2007/02/19/passwd-user-not-known-to-the-underlying-authentication-module/
>
> and many more by doing a Google search of your error.
>
> Your solution may already exist out there.  Might be better than
> seeking to have someone re-trouble shoot something that may have
> already been trouble shot and posted online.
>
> I note that you didn't log in as root but rather did a su - to root.
> Try one of the other terminal windows (CTRL-ALT F1-F6) and log in as
> root from one of those and try to change it. See if that makes a
> difference.
>
> Jacques B.
>
>   
Thanks, the solving of the problem by writing "pwconv"in terminal 
.Thanks for your help .