/etc/xdg/xfce4/Xft.xrdb is in xfce4-session 4.12.1-3ubuntu1.
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 | ! Those are fallback settings, use the ui plugin to change it
! or add your overrides to ~/.Xresources
! Xft.hintstyle: hintnone/hintslight/hintmedium/hintfull
! Xft hinting: 1/0
Xft.hinting: 1
Xft.hintstyle: hintmedium
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