Bug 511577 - On a fresh Debian 13 (Trixie) installation with KDE Plasma 6 (x11), the screen locker (kscreenlocker_greet) periodically fails to unlock.
Summary: On a fresh Debian 13 (Trixie) installation with KDE Plasma 6 (x11), the scree...
Status: RESOLVED UNMAINTAINED
Alias: None
Product: plasmashell
Classification: Plasma
Component: Screen locking (other bugs)
Version First Reported In: 6.3.6
Platform: Debian stable Linux
: NOR normal
Target Milestone: 1.0
Assignee: Plasma Bugs List
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-11-03 15:17 UTC by Marios Korras Carraca
Modified: 2025-11-03 17:02 UTC (History)
1 user (show)

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Description Marios Korras Carraca 2025-11-03 15:17:30 UTC 
Each time the session locks, the journal shows:

PAM unable to dlopen(pam_sss.so): /usr/lib/security/pam_sss.so: cannot open shared object file: No such file or directory
PAM adding faulty module: pam_sss.so

Sometimes the lock screen remains frozen or completely unresponsive to password input.
Installing libpam-sss (not-preinstalled in my system) seems to fix the issue.

Steps to Reproduce:

1) Install Debian 13 (Trixie) with KDE Plasma (no libpam-sss installed).

2) Boot normally and log into a Plasma session (x11).

3) Lock the screen

4) Attempt to unlock — sometimes the greeter accepts input but does not respond, or remains frozen.

journalctl -b | grep pam_sss
 PAM unable to dlopen(pam_sss.so): /usr/lib/security/pam_sss.so: cannot open shared object file: No such file or directory
PAM adding faulty module: pam_sss.so

Installing libpam-sss seems to correct (for now) the problem.
Comment 1 Bug Janitor Service 2025-11-03 15:33:41 UTC 
Thank you for the bug report!

Debian advises users to not submit bugs upstream (https://www.debian.org/Bugs/Reporting), and Plasma 6.3.6 is no longer eligible for support or maintenance from KDE. It's possible that the issue exists only in Debian at this point.

Could you report the bug to Debian using the report bug utility (https://packages.debian.org/stable/utils/reportbug)? If necessary, the maintainer of the package will forward the bug upstream.
Thanks for understanding!

Thanks again!
Comment 2 Marios Korras Carraca 2025-11-03 17:02:14 UTC 
(In reply to Bug Janitor Service from comment #1)
> Thank you for the bug report!
> 
> Debian advises users to not submit bugs upstream
> (https://www.debian.org/Bugs/Reporting), and Plasma 6.3.6 is no longer
> eligible for support or maintenance from KDE. It's possible that the issue
> exists only in Debian at this point.
> 
> Could you report the bug to Debian using the report bug utility
> (https://packages.debian.org/stable/utils/reportbug)? If necessary, the
> maintainer of the package will forward the bug upstream.
> Thanks for understanding!
> 
> Thanks again!

Thank you for the follow-up!

I have reported the issue to Debian as suggested.
It has been filed as bug #1119987:

Best regards
M.K.K