Le 10/02/2018 à 09:55, Ed Greshko a écrit :
> On 02/10/18 16:42, François Patte wrote:
>> Le 10/02/2018 à 09:32, Ed Greshko a écrit :
>>> On 02/10/18 16:12, François Patte wrote:
>>>> Le 09/02/2018 à 18:46, Rick Stevens a écrit :
>>>>> On 02/09/2018 08:05 AM, François Patte wrote:
>>>>>> Le 09/02/2018 à 15:33, Ed Greshko a écrit :
>>>>>>> On 02/09/18 22:13, François Patte wrote:
>>>>>>>> Seems to be an empirical way to solve the problem! Nobody knows what is
>>>>>>>> responsible for such a message (Authenticate result for user cath  :
>>>>>>>> User not known to the underlying authentication module)? What is this
>>>>>>>> module and how to inform it that a new user was added?
>>>>>>> Well, since I am the only one who has responded to your query and since I only know
>>>>>>> what I have found by using google, I guess nobody knows for sure what is causing the
>>>>>>> problem.
>>>>>> Trying your trick gives the same result: once the password has been
>>>>>> given, lightdm behaves like if it was a wrong password and user can't log!
>>>>>>
>>>>>>> At this point are you more interested in getting that user logged in under lightdm or
>>>>>>> finding out why they have been unable to?
>>>>>> I am interested in both, it is quite boring that something has been done
>>>>>> somewhere and messages in log files are not enough explicit to solve the
>>>>>> problem.... This tends to make the system more secretive.
>>>>>>
>>>>>> I googled too, and find some answer related to pam, to ldap.... Nothing
>>>>>> about lightdm!
>>>>> Please check the system logs. It may be an issue with libcrypt (e.g. the
>>>>> version desired isn't there). I've had that issue with a laptop before
>>>>> where the PAM system wanted libcrypto.so.6 (which was what was
>>>>> originally installed way back when) but the current version was
>>>>> libcrypto.so.10.
>>>> In that case wouldn't be impossible to login for all users?
>>>>
>>>>
>>> Would you consider to try another DM?
>> DM?
>>
> light(dm)   dm=Display Manager
>
> You could try sddm, kdm, or gdm?

I don't want to do that: I dislike gnome or kde and do not want to
introduce a lot of dependancies....

I solved the problem but I am still wondering why this issue hapenned:

lightdm uses accountservice and for other users there is file

/var/lib/AccountsService/users/user-name

which seems to has been created by adduser when their account was created.

Why, for this particular user this file was not created, I don't know! I
deleted and recreated the account but this file was not created and I
had to do it manually....

This file is very simple and contains:

[User]
Language=fr_FR.utf8
XSession=xfce
SystemAccount=false

That's all!

Now, if anybody has a clue, I will have better nights!

Thank you.

--
François Patte
UFR de mathématiques et informatique
Laboratoire CNRS MAP5, UMR 8145
Université Paris Descartes
45, rue des Saints Pères
F-75270 Paris Cedex 06
Tél. +33 (0)6 7892 5822
http://www.math-info.univ-paris5.fr/~patte


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