/etc/xdg/autostart/xdg-user-dirs.desktop is in xdg-user-dirs 0.17-1ubuntu1.
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 | [Desktop Entry]
Type=Application
Name=User folders update
TryExec=xdg-user-dirs-update
Exec=xdg-user-dirs-update
StartupNotify=false
NoDisplay=true
X-Ubuntu-Gettext-Domain=xdg-user-dirs
X-GNOME-Autostart-Phase=Initialization
X-KDE-autostart-phase=1
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