/etc/xdg/autostart/onboard-autostart.desktop is in onboard 1.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | [Desktop Entry]
Name=Onboard
Exec=onboard --not-show-in=GNOME,GNOME-Classic:GNOME --startup-delay=3.0
Type=Application
NoDisplay=true
X-Ubuntu-Gettext-Domain=onboard
AutostartCondition=GSettings org.gnome.desktop.a11y.applications screen-keyboard-enabled
X-GNOME-AutoRestart=true
OnlyShowIn=GNOME;Unity;MATE;
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