Comment 9 for bug 1366209

One way is to save the contents in some files using these commands:

cat /home/abby/.xsession-errors > /var/tmp/errors.txt

cat /home/abby/.xsession-errors.old > /var/tmp/errors.old.txt

sudo cat /var/log/lightdm/lightdm.log > /var/tmp/lightdm.log.txt

Then start a guest session and do it from there.