When I press [Ctrl+Alt+F<1-6>] it takes me to tty1 through tty6 respectively, no problem. But at the login prompt, if I try to login with my username and password, it just immediately takes me back to the same login prompt. The only way I can actually log in to the console is as root.
Here're the relevant lines from my /var/log/auth.log
Nov 2 21:03:04 bhh1988-H67MA-USB3-B3 login: pam_unix(login:session): session opened for user bhh1988 by LOGIN(uid=0) Nov 2 21:03:04 bhh1988-H67MA-USB3-B3 login: pam_unix(login:session): session closed for user bhh1988 Nov 2 21:03:53 bhh1988-H67MA-USB3-B3 login: pam_unix(login:session): session opened for user root by bhh1988(uid=0) Nov 2 21:03:53 bhh1988-H67MA-USB3-B3 login: ROOT LOGIN on '/dev/tty1'
You see that at 21:03:04 I try to login as bhh1988, but the session just opens and immediately closes. About 50 seconds later I tried logging in as root, which is successful. Interestingly it says that the session was opened by bhh1988 (my username) though.
I also checked out /var/log/syslog and /var/log/kern.log. At the time of the login failure, I see the line:
Nov 2 21:03:04 bhh1988-H67MA-USB3-B3 kernel: [ 1430.218803] init: tty1 main process ended, respawning
Any idea what's going on, or what else I can look at for more clues?
I am on Ubuntu 12.04
Here is my /etc/pam.d/login file:
# # The PAM configuration file for the Shadow `login' service # # Enforce a minimal delay in case of failure (in microseconds). # (Replaces the `FAIL_DELAY' setting from login.defs) # Note that other modules may require another minimal delay. (for example, # to disable any delay, you should add the nodelay option to pam_unix) auth optional pam_faildelay.so delay=3000000 # Outputs an issue file prior to each login prompt (Replaces the # ISSUE_FILE option from login.defs). Uncomment for use # auth required pam_issue.so issue=/etc/issue # Disallows root logins except on tty's listed in /etc/securetty # (Replaces the `CONSOLE' setting from login.defs) # # With the default control of this module: # [success=ok new_authtok_reqd=ok ignore=ignore user_unknown=bad default=die] # root will not be prompted for a password on insecure lines. # if an invalid username is entered, a password is prompted (but login # will eventually be rejected) # # You can change it to a "requisite" module if you think root may mis-type # her login and should not be prompted for a password in that case. But # this will leave the system as vulnerable to user enumeration attacks. # # You can change it to a "required" module if you think it permits to # guess valid user names of your system (invalid user names are considered # as possibly being root on insecure lines), but root passwords may be # communicated over insecure lines. auth [success=ok new_authtok_reqd=ok ignore=ignore user_unknown=bad default=die] pam_securetty.so # Disallows other than root logins when /etc/nologin exists # (Replaces the `NOLOGINS_FILE' option from login.defs) auth requisite pam_nologin.so # SELinux needs to be the first session rule. This ensures that any # lingering context has been cleared. Without out this it is possible # that a module could execute code in the wrong domain. # When the module is present, "required" would be sufficient (When SELinux # is disabled, this returns success.) session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so close # This module parses environment configuration file(s) # and also allows you to use an extended config # file /etc/security/pam_env.conf. # # parsing /etc/environment needs "readenv=1" session required pam_env.so readenv=1 # locale variables are also kept into /etc/default/locale in etch # reading this file *in addition to /etc/environment* does not hurt session required pam_env.so readenv=1 envfile=/etc/default/locale # Standard Un*x authentication. @include common-auth # This allows certain extra groups to be granted to a user # based on things like time of day, tty, service, and user. # Please edit /etc/security/group.conf to fit your needs # (Replaces the `CONSOLE_GROUPS' option in login.defs) auth optional pam_group.so # Uncomment and edit /etc/security/time.conf if you need to set # time restrainst on logins. # (Replaces the `PORTTIME_CHECKS_ENAB' option from login.defs # as well as /etc/porttime) # account requisite pam_time.so # Uncomment and edit /etc/security/access.conf if you need to # set access limits. # (Replaces /etc/login.access file) # account required pam_access.so # Sets up user limits according to /etc/security/limits.conf # (Replaces the use of /etc/limits in old login) session required pam_limits.so # Prints the last login info upon succesful login # (Replaces the `LASTLOG_ENAB' option from login.defs) session optional pam_lastlog.so # Prints the motd upon succesful login # (Replaces the `MOTD_FILE' option in login.defs) session optional pam_motd.so # Prints the status of the user's mailbox upon succesful login # (Replaces the `MAIL_CHECK_ENAB' option from login.defs). # # This also defines the MAIL environment variable # However, userdel also needs MAIL_DIR and MAIL_FILE variables # in /etc/login.defs to make sure that removing a user # also removes the user's mail spool file. # See comments in /etc/login.defs session optional pam_mail.so standard # Standard Un*x account and session @include common-account @include common-session @include common-password # SELinux needs to intervene at login time to ensure that the process # starts in the proper default security context. Only sessions which are # intended to run in the user's context should be run after this. session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so open # When the module is present, "required" would be sufficient (When SELinux # is disabled, this returns success.)
The only obvious thing to look for to me from this login file is the part that says:
# Disallows other than root logins when /etc/nologin exists # (Replaces the `NOLOGINS_FILE' option from login.defs) auth requisite pam_nologin.so
But I don't have an /etc/nologin so that doesn't appear to me the culprit.