18.04 login to Lightdm

[Jack McGee]

Not sure what happened here.  I get login loop on desktop login. fills 
in default username, but after entering password, screen goes black 
briefly then goes back to login prompt.

I can login via SSH using same username/password combination.

I have pretty good backups if restoring something will fix this. I tried 
restoring the /etc/lightdm folder but no difference.

mythuser at amethi:/var/log$ sudo tail -n50 auth.log

Oct 31 10:09:22 amethi sudo: mythuser : TTY=pts/0 ; PWD=/var/log ; 
USER=root ; COMMAND=/usr/sbin/service lightdm restart
Oct 31 10:09:22 amethi sudo: pam_unix(sudo:session): session opened for 
user root by mythuser(uid=0)
Oct 31 10:09:22 amethi systemd-logind[1072]: Removed session c12.
Oct 31 10:09:22 amethi sudo: pam_unix(sudo:session): session closed for 
user root
Oct 31 10:09:23 amethi lightdm: PAM unable to dlopen(pam_kwallet.so): 
/lib/security/pam_kwallet.so: cannot open shared object file: No such 
file or directory
Oct 31 10:09:23 amethi lightdm: PAM adding faulty module: pam_kwallet.so
Oct 31 10:09:23 amethi lightdm: PAM unable to dlopen(pam_kwallet5.so): 
/lib/security/pam_kwallet5.so: cannot open shared object file: No such 
file or directory
Oct 31 10:09:23 amethi lightdm: PAM adding faulty module: pam_kwallet5.so
Oct 31 10:09:23 amethi lightdm: pam_unix(lightdm-greeter:session): 
session opened for user lightdm by (uid=0)
Oct 31 10:09:23 amethi systemd: pam_unix(systemd-user:session): session 
opened for user lightdm by (uid=0)
Oct 31 10:09:23 amethi systemd-logind[1072]: New session c13 of user 
lightdm.
Oct 31 10:09:23 amethi lightdm: PAM unable to dlopen(pam_kwallet.so): 
/lib/security/pam_kwallet.so: cannot open shared object file: No such 
file or directory
Oct 31 10:09:23 amethi lightdm: PAM adding faulty module: pam_kwallet.so
Oct 31 10:09:23 amethi lightdm: PAM unable to dlopen(pam_kwallet5.so): 
/lib/security/pam_kwallet5.so: cannot open shared object file: No such 
file or directory
Oct 31 10:09:23 amethi lightdm: PAM adding faulty module: pam_kwallet5.so
Oct 31 10:09:23 amethi lightdm: pam_succeed_if(lightdm:auth): 
requirement "user ingroup nopasswdlogin" not met by user "mythuser"
Oct 31 10:09:40 amethi systemd-logind[1072]: Removed session c13.

mythuser at amethi:/etc/lightdm$ cat /etc/lightdm/lightdm.conf
[SeatDefaults]
#autologin-guest=false

#autologin-user=mythuser
#autologin-user-timeout=5
#autologin-session=lightdm-autologin
mythuser at amethi:/etc/lightdm$ cat /etc/lightdm/lightdm.conf
[SeatDefaults]
#autologin-guest=false

#autologin-user=mythuser
#autologin-user-timeout=5
#autologin-session=lightdm-autologin