/etc/skel/.config/Trolltech.conf 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.
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font="Noto Sans,10,-1,5,50,0,0,0,0,0"
style=GTK+
doubleClickInterval=400
cursorFlashTime=1200
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