Thank you Barry. The article says that the vulnerability can only be exploited if the person logging in as guest has physical access to the computer. I am the only one who uses this laptop so that is not a concern.
As instructed in the article, I added the lines: [Seat:*] allow-guest=true to: /etc/lightdm/lightdm.conf This got the the Guest Session login working. There was a minor annoyance of "Error. No session PID " message box popping upon logging in. I used a simple workaround found here: https://bugs.launchpad.net/ubuntu/+source/lxsession/+bug/1273524/comments/35 Guest session works well now, no problems. Thanks again, Ajay
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