Comment 22 for bug 1309535

Six month later I have the same issue. I can't login as ordinary user rose with lightdm.
It is an Ubuntu 15.04 for armv7l .
At the beginning I saw the 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 too.

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