Comment 2 for bug 1404172

Problem is still met on vivid i386, from journalctl (destop booted with systemd-sysv):

lightdm[970]: initctl: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused
lightdm[1033]: PAM unable to dlopen(pam_kwallet.so): /lib/security/pam_kwallet.so: cannot open shared object file: No such file or directory
lightdm[1033]: PAM adding faulty module: pam_kwallet.so
lightdm[1033]: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)