The file /etc/xdg/autostart/xscreensaver.desktop belongs to the xfce4-session package, see /var/lib/dpkg/info/xfce4-session.conffiles
On a fresh Xubuntu 20.04 installation the light-locker package is not installed, that would explain why not more people are affected by this.
The file /etc/xdg/ autostart/ xscreensaver. desktop belongs to the xfce4-session package, see dpkg/info/ xfce4-session. conffiles
/var/lib/
On a fresh Xubuntu 20.04 installation the light-locker package is not installed, that would explain why not more people are affected by this.