Also after upgrading to Ubuntu 15.10 the situation does not improved. If I login as user rose with password just after reboot, the login form disappears, I can move the mouse pointer, but I can't do any action. There is neither an application nor a mouse menu (right click to the background). I then login via ssh as user odroid. 'who' shows me that a user rose is logged in:

odroid@odroid6:~$ who
rose     :0           2015-12-01 12:41 (:0)
odroid   pts/1        2015-12-01 12:43 (192.168.1.81)

And /var/log/auth.log says again that the requirement "user ingroup nopasswdlogin" not met by user "rose":

odroid@odroid6:~$ tail -n 40  /var/log/auth.log
Dec  1 12:40:37 odroid6 sshd[780]: Server listening on 0.0.0.0 port 22.
Dec  1 12:40:37 odroid6 sshd[780]: Server listening on :: port 22.
Dec  1 12:40:38 odroid6 lightdm: PAM unable to dlopen(pam_kwallet.so): /lib/security/pam_kwallet.so: cannot open shared object file: No such file or directory
Dec  1 12:40:38 odroid6 lightdm: PAM adding faulty module: pam_kwallet.so
Dec  1 12:40:38 odroid6 lightdm: PAM unable to dlopen(pam_kwallet5.so): /lib/security/pam_kwallet5.so: cannot open shared object file: No such file or directory
Dec  1 12:40:38 odroid6 lightdm: PAM adding faulty module: pam_kwallet5.so
Dec  1 12:40:38 odroid6 lightdm: pam_succeed_if(lightdm:auth): requirement "user ingroup nopasswdlogin" not met by user "rose"
Dec  1 12:40:58 odroid6 dbus[767]: [system] Failed to activate service 'org.bluez': timed out
Dec  1 12:41:14 odroid6 lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
Dec  1 12:41:14 odroid6 lightdm: pam_unix(lightdm:session): session opened for user rose by (uid=0)
Dec  1 12:41:14 odroid6 systemd-logind[730]: New session c2 of user rose.
Dec  1 12:41:14 odroid6 systemd: pam_unix(systemd-user:session): session opened for user rose by (uid=0)
Dec  1 12:42:33 odroid6 systemd-logind[730]: Removed session c1.
Dec  1 12:42:33 odroid6 systemd: pam_unix(systemd-user:session): session closed for user lightdm
Dec  1 12:43:14 odroid6 sshd[1550]: Accepted password for odroid from 192.168.1.81 port 52770 ssh2
Dec  1 12:43:14 odroid6 sshd[1550]: pam_unix(sshd:session): session opened for user odroid by (uid=0)
Dec  1 12:43:14 odroid6 systemd-logind[730]: New session c3 of user odroid.
Dec  1 12:43:14 odroid6 systemd: pam_unix(systemd-user:session): session opened for user odroid by (uid=0)
Dec  1 12:45:31 odroid6 su[1795]: Successful su for nobody by root
Dec  1 12:45:31 odroid6 su[1795]: + ??? root:nobody
Dec  1 12:45:31 odroid6 su[1795]: pam_unix(su:session): session opened for user nobody by (uid=0)
Dec  1 12:45:31 odroid6 systemd-logind[730]: New session c4 of user nobody.
Dec  1 12:45:31 odroid6 systemd: pam_unix(systemd-user:session): session opened for user nobody by (uid=0)
Dec  1 12:45:32 odroid6 su[1795]: pam_unix(su:session): session closed for user nobody
Dec  1 12:45:32 odroid6 systemd-logind[730]: Removed session c4.
Dec  1 12:45:32 odroid6 su[1821]: Successful su for nobody by root
Dec  1 12:45:32 odroid6 su[1821]: + ??? root:nobody
Dec  1 12:45:32 odroid6 su[1821]: pam_unix(su:session): session opened for user nobody by (uid=0)
Dec  1 12:45:32 odroid6 systemd-logind[730]: New session c5 of user nobody.
Dec  1 12:45:32 odroid6 systemd: pam_unix(systemd-user:session): session closed for user nobody
Dec  1 12:45:32 odroid6 su[1821]: pam_unix(su:session): session closed for user nobody
Dec  1 12:45:32 odroid6 systemd-logind[730]: Removed session c5.
Dec  1 12:45:32 odroid6 su[1844]: Successful su for nobody by root
Dec  1 12:45:32 odroid6 su[1844]: + ??? root:nobody
Dec  1 12:45:32 odroid6 su[1844]: pam_unix(su:session): session opened for user nobody by (uid=0)
Dec  1 12:45:32 odroid6 systemd-logind[730]: New session c6 of user nobody.
Dec  1 12:45:32 odroid6 systemd: pam_unix(systemd-user:session): session opened for user nobody by (uid=0)
Dec  1 12:46:26 odroid6 su[1844]: pam_unix(su:session): session closed for user nobody
Dec  1 12:46:26 odroid6 systemd-logind[730]: Removed session c6.
Dec  1 12:46:26 odroid6 systemd: pam_unix(systemd-user:session): session closed for user nobody
odroid@odroid6:~$