I've done a lot of googling but haven't been able to find a solution to my problem.
I am a teacher and I'm using Xubuntu on some student computers. I have everything locked down pretty good, but I can't figure out how to restrict users from changing the wallpaper without having to out the whole machine in Kiosk mode. I don't care if they change it during their work session, but I would like to create a crontab that resets back to the original .png at reboot.
I'm hoping for a simple cron entry but I'm willing to ease into the world of shell scripts if that's what it takes.