It was disabled due to bug 1421443.
Now with Xubuntu 19.10 and the switch to xfce4-screensaver it may be possible to enable it again. Note that this new change only disables the lock setting, and not the autostart entry.
https://git.launchpad.net/xubuntu-default-settings/commit/?id=650fd90df8d1e3e7b15fd789907fa47e9e2f68e5
It was disabled due to bug 1421443.
Now with Xubuntu 19.10 and the switch to xfce4-screensaver it may be possible to enable it again. Note that this new change only disables the lock setting, and not the autostart entry.
https:/ /git.launchpad. net/xubuntu- default- settings/ commit/ ?id=650fd90df8d 1e3e7b15fd78990 7fa47e9e2f68e5