/etc/profile.d/gtk-accessibility.sh 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 | # Ensure GTK accessibility modules are active.
if [ -z "$GTK_MODULES" ] ; then
GTK_MODULES=gail:atk-bridge
else
GTK_MODULES="$GTK_MODULES:gail:atk-bridge"
fi
export GTK_MODULES
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