[Unit]
Description=Tasks to be run before GNOME Session starts
OnFailure=gnome-session-shutdown.target
OnFailureJobMode=replace-irreversibly
DefaultDependencies=no
RefuseManualStart=yes
RefuseManualStop=yes

Requires=graphical-session-pre.target
After=graphical-session-pre.target

Requisite=gnome-session-initialized.target
PartOf=gnome-session-initialized.target
Before=gnome-session-initialized.target