/etc/X11/Xsession.d/56ubuntustudio-session is in ubuntustudio-default-settings 0.61.
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 | # Set default environment vars in Xubuntu
if [ "$DESKTOP_SESSION" = ubuntustudio ]; then
# Disable GTK 3.16 overlay scrollbars
export GTK_OVERLAY_SCROLLING=0
# QT5 apps to use GTK style
export QT_STYLE_OVERRIDE=gtk
# Workaround clutter issue (LP: #1462445)
export CLUTTER_BACKEND=x11
fi
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