Não é possível fazer o login no Ubuntu 12.04 após a atualização

Question

Eu enfrento um loop de login e não consigo fazer login.

Eu tentei reinstalar o lightdm, ubuntu-desktop, mas não ajuda. Eu instalei o gdm e o usei como padrão por um tempo para ver se era um problema lightdm.

Mas aqui parece que há 3 tentativas incorretas de senha em algo que começa quando eu faço o login. Acho que meu arquivo sudoers está correto.

Aqui está o meu auth.log -

May 23 14:52:01 ubuntu-desktop lightdm: pam_unix(lightdm:session): session closed for user lightdm
May 23 14:52:02 ubuntu-desktop lightdm: pam_unix(lightdm:session): session opened for user angad by (uid=0)
May 23 14:52:02 ubuntu-desktop lightdm: pam_ck_connector(lightdm:session): nox11 mode, ignoring PAM_TTY :0
May 23 14:52:02 ubuntu-desktop sudo: pam_unix(sudo:auth): conversation failed
May 23 14:52:02 ubuntu-desktop sudo: pam_unix(sudo:auth): auth could not identify password for [angad]
May 23 14:52:02 ubuntu-desktop sudo: pam_unix(sudo:auth): conversation failed
May 23 14:52:02 ubuntu-desktop sudo: pam_unix(sudo:auth): auth could not identify password for [angad]
May 23 14:52:02 ubuntu-desktop sudo: pam_unix(sudo:auth): conversation failed
May 23 14:52:02 ubuntu-desktop sudo: pam_unix(sudo:auth): auth could not identify password for [angad]
May 23 14:52:02 ubuntu-desktop sudo:    angad : 3 incorrect password attempts ; TTY=unknown ; PWD=/home/angad ; USER=root ; COMMAND=/bin/bash
May 23 14:52:05 ubuntu-desktop lightdm: pam_unix(lightdm:session): session closed for user angad
May 23 14:52:06 ubuntu-desktop lightdm: pam_unix(lightdm:session): session opened for user lightdm by (uid=0)
May 23 14:52:06 ubuntu-desktop lightdm: pam_ck_connector(lightdm:session): nox11 mode, ignoring PAM_TTY :0
May 23 14:52:07 ubuntu-desktop lightdm: pam_succeed_if(lightdm:auth): requirement "user ingroup nopasswdlogin" not met by user "angad"
May 23 14:52:07 ubuntu-desktop dbus[936]: [system] Rejected send message, 2 matched rules; type="method_call", sender=":1.166" (uid=104 pid=7935 comm="/usr/lib/indicator-datetime/indicator-datetime-ser") interface="org.freedesktop.DBus.Properties" member="GetAll" error name="(unset)" requested_reply="0" destination=":1.17" (uid=0 pid=1426 comm="/usr/sbin/console-kit-daemon --no-daemon ")