/etc/X11/Xsession.d/99mate-environment is in ubuntu-mate-default-settings 16.04.5.
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 19 | # This file is sourced by Xsession(5), not executed.
if [ "x$DESKTOP_SESSION" = "xmate" ] || [ "x$XDG_SESSION_DESKTOP" == "xmate" ]; then
if [ -z "$GTK_MODULES" ] ; then
GTK_MODULES="canberra-gtk-module:topmenu-gtk-module"
else
GTK_MODULES="$GTK_MODULES:canberra-gtk-module:topmenu-gtk-module"
fi
export GTK_MODULES
# Disable GTK3 overlay scrollbars
export GTK_OVERLAY_SCROLLING=0
# QT apps to use GTK styling
export QT_STYLE_OVERRIDE=gtk
# Workaround clutter issue (LP: #1462445)
export CLUTTER_BACKEND=x11
fi
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