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Restore original config file on Ubuntu

From http://askubuntu.com/questions/66533/how-can-i-restore-configuration-files

# dpkg -S unity-greeter.conf
unity-greeter: /etc/lightdm/unity-greeter.conf
# mv /etc/lightdm/unity-greeter.conf /etc/lightdm/unity-greeter.conf.bak 
# apt-get -o Dpkg::Options::="--force-confmiss" install --reinstall <unity-greeter

If everything worked as expected, you should get this message:

Configuration file `/etc/lightdm/unity-greeter.conf', does not exist on system. Installing new config file as you requested.

Log Errors

sshd[5801]: syslogin_perform_logout: logout() returned an error

• No /etc/ttys? See http://www.derkeiler.com/Mailing-Lists/securityfocus/Secure_Shell/2004-05/0024.html for an explanation and solution on a FreeBSD jail (4.9!). But Linux doesn't use /etc/ttys; see http://superuser.com/questions/124908/how-do-you-change-the-default-term-value-set-at-console-login-ubuntu.
• Debian bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=75250
• RedHat bug: https://bugzilla.redhat.com/show_bug.cgi?id=125589