I posted this issue also to tho Odroid forum: http://forum.odroid.com/viewtopic.php?f=95&t=17699
It seems that they found a solution. -- You received this bug notification because you are a member of Desktop 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: New 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/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp