/etc/X11/Xsession.d/55xfce4-session is in xfce4-session 4.12.1-3ubuntu3.
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 13 14 15 16 17 18 | # For Xfce, we add a directory to XDG_DATA_DIRS
# to allow the admin to set, for example, defaults.list properly
BASESTARTUP=$(basename "$STARTUP" | cut -d\ -f1)
if [ "$BASESTARTUP" = x-session-manager ]; then
BASESTARTUP=$(basename $(readlink /etc/alternatives/x-session-manager))
fi
case "$BASESTARTUP" in
xfce4-session|startxfce4)
# We prepend /usr/share/xfce4 since its defaults.list actually points
# to /etc so it is configurable.
if [ -z "$XDG_DATA_DIRS" ]; then
XDG_DATA_DIRS=/usr/share/xfce4:/usr/local/share/:/usr/share/
else
XDG_DATA_DIRS=/usr/share/xfce4:"$XDG_DATA_DIRS"
fi
export XDG_DATA_DIRS
;;
esac
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