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/etc/profile.d/add_custom_to_xdg_data.sh is in ubuntu-touch-session 0.108+16.04.20160407-0ubuntu1.

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# For bug LP: #1413818, we need to unclude /custom/usr/share for customized
# notification sounds to work
export XDG_DATA_DIRS=$XDG_DATA_DIRS:"/custom/usr/share/"