I figured out what my problem was, and since I haven't seen any solutions anywhere else, hopefully this will be of some use to the next person. In my case it turned out to be the Nvidia driver, which installed its modules under /lib/modules/4.8.0-32-generic. When I upgraded to 4.8.0-34, it couldn't find the drivers. See https://ubuntuforums.org/showthread.php?t=2349132 for more information.
Of course this doesn't explain why it was looking for pam_kwallet.so, which I suspect is a separate issue. -- 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/1511824 Title: Can't login as ordinary user with lightdm Status in lightdm package in Ubuntu: Confirmed Bug description: I can't login as ordinary user rose with lightdm. It is an Ubuntu 15.04 for armv7l . At the beginning I saw the already reported issues with kwallet, which is not installed. I commented out the corresponding lines in. I have now: root@odroid6:~# cat /etc/pam.d/lightdm #%PAM-1.0 auth requisite pam_nologin.so auth sufficient pam_succeed_if.so user ingroup nopasswdlogin @include common-auth auth optional pam_gnome_keyring.so #auth optional pam_kwallet.so @include common-account session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so close session required pam_limits.so @include common-session session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so open session optional pam_gnome_keyring.so auto_start #session optional pam_kwallet.so auto_start session required pam_env.so readenv=1 session required pam_env.so readenv=1 user_readenv=1 envfile=/etc/default/locale @include common-password and root@odroid6:~# cat /etc/pam.d/lightdm-greeter #%PAM-1.0 auth required pam_permit.so auth optional pam_gnome_keyring.so #auth optional pam_kwallet.so @include common-account session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so close session required pam_limits.so @include common-session session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so open session optional pam_gnome_keyring.so auto_start #session optional pam_kwallet.so auto_start session required pam_env.so readenv=1 session required pam_env.so readenv=1 user_readenv=1 envfile=/etc/default/locale It seems that my password is accepted (login via ssh works perfectly), but with lightdm I get only a black screen with mouse cursor. Login as user odroid which is in group nopasswdlogin with lightdm works. After trying to login as user rose, I have to login with ssh and kill all processes owned by rose. At the end of /var/log/auth.log I see: Oct 28 19:34:17 odroid6 lightdm: pam_succeed_if(lightdm:auth): requirement "user ingroup nopasswdlogin" not met by user "rose" Oct 28 19:34:26 odroid6 lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm Oct 28 19:34:26 odroid6 lightdm: pam_unix(lightdm:session): session opened for user rose by (uid=0) Oct 28 19:34:26 odroid6 systemd-logind[651]: New session c8 of user rose. Oct 28 19:34:26 odroid6 systemd: pam_unix(systemd-user:session): session opened for user rose by (uid=0) Oct 28 19:35:10 odroid6 systemd-logind[651]: Removed session c6. Oct 28 19:35:10 odroid6 systemd: pam_unix(systemd-user:session): session closed for user lightdm ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: lightdm 1.14.2-0ubuntu1.1 Uname: Linux 3.10.82-57 armv7l ApportVersion: 2.17.2-0ubuntu1.7 Architecture: armhf Date: Fri Oct 30 18:14:21 2015 ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: lightdm UpgradeStatus: No upgrade log present (probably fresh install) mtime.conffile..etc.pam.d.lightdm: 2015-10-28T17:40:04.609656 mtime.conffile..etc.pam.d.lightdm.greeter: 2015-10-28T17:53:38.848444 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1511824/+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
