Re: lightdm authentication failure for one user [more info]

[George N. White III]

On 12 February 2018 at 13:10, François Patte <
francois.patte(a)mi.parisdescartes.fr&gt; wrote:

>  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!
>  

Have you seen
https://askubuntu.com/questions/139412/enabling-a-user-created-with-addus...
?

https://bugs.launchpad.net/lightdm/+bug/1019314 indicates that lightdm
switched
to using PAM via accountservice for user prefs in 2012, causing issues
for scripts that were storing user prefs to ~/.dmrc.

4 years is about long enough for someone to have forgotten that lightdm has
to be
handled differently.  Many systems have multiple ways to add a user
(different GUI's
as well as `adduser` versus `useradd`).  Is it possible that a different
tool was used
for the  problem user?  If not, perhaps something different in that user's
configuration
caused the tool to use a different logic path and encounter a bug -- either
never patched
in 2012-2013 or recently introduced.



>  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. [phone]
>  http://www.math-info.univ-paris5.fr/~patte
>
>
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>  

-- 
George N. White III