The correct way to fix this issue is not to comment out the lines mentioning kwallet, but to make the modules silent by prepending a '-' (dash) to each line. Example:
# /etc/pam.d/lightdm -auth optional pam_kwallet.so -auth optional pam_kwallet5.so -session optional pam_kwallet.so auto_start -session optional pam_kwallet5.so auto_start Same in /etc/pam.d/lightdm-greeter. This feature is mentioned in the pam.conf(5) manpage: If the type value from the list above is prepended with a - character the PAM library will not log to the system log if it is not possible to load the module because it is missing in the system. This can be useful especially for modules which are not always installed on the system and are not required for correct authentication and authorization of the login session. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1309535 Title: Running without pam-kwallet installed issues a warning in auth.log Status in lightdm package in Ubuntu: Won't Fix Status in pam package in Ubuntu: Won't Fix Bug description: After upgrading to lightdm 1.10.0-0ubuntu2 I started to see this error in auth.log: Apr 10 14:34:54 simon-laptop lightdm: PAM unable to dlopen(pam_kwallet.so): /lib/security/pam_kwallet.so: cannot open shared object file: No such file or directory Apr 10 14:34:54 simon-laptop lightdm: PAM adding faulty module: pam_kwallet.so This seems like a regression because with lightdm 1.10.0-0ubuntu1 or before I didn't have this error showing. FYI, I don't have the pam- kwallet package installed. $ lsb_release -rd Description: Ubuntu 14.04 LTS Release: 14.04 $ apt-cache policy lightdm pam-kwallet lightdm: Installed: 1.10.0-0ubuntu3 Candidate: 1.10.0-0ubuntu3 Version table: *** 1.10.0-0ubuntu3 0 500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages 100 /var/lib/dpkg/status ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: lightdm 1.10.0-0ubuntu3 ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 CurrentDesktop: Unity Date: Fri Apr 18 09:12:37 2014 InstallationDate: Installed on 2014-01-26 (81 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140124) SourcePackage: lightdm UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1309535/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp