/etc/xdg/autostart/polkit-gnome-authentication-agent-1.desktop is in policykit-1-gnome 0.105-2ubuntu2.
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 10 11 12 | [Desktop Entry]
Name=PolicyKit Authentication Agent
Comment=PolicyKit Authentication Agent
Exec=/usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1
Terminal=false
Type=Application
Categories=
NoDisplay=true
OnlyShowIn=GNOME;XFCE;Unity;
X-GNOME-AutoRestart=true
AutostartCondition=GNOME3 unless-session gnome
X-Ubuntu-Gettext-Domain=polkit-gnome-1
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