Comment 6 for bug 1610619

Well, if this only happens on Linux Mint, you are on the wrong bug tracker. I added the Linux Mint task to the report.

With that said, the lightdm developers are possibly willing to add whatever is required to address this issue, but in that case they need to know - really know - what would be required. Myself is working with Ubuntu and sometimes the official flavors, so I can't help there.

As regards your ideas in comment #5, the first one is already there in /usr/lib/lightdm/guest-session-auto.sh. When I had a quick look in Xubuntu, I got the impression that the xscreensaver settings are saved in ~/.xscreensaver rather than as gsettings values, but I may not have got the whole picture.

So the ball is in your court again. ;)