Public bug reported:

I am a Xubuntu/XFCE user and noticed that my subpixel rendering was
broken. Even so the subpixel order was set to "None", fonts would render
with subpixel order "RGB". If I set the subpixel order to BGR, Vertical
RGB/BGR however things would work. Only the 'None' option had the
problem.

The problem turned out to be this symlink from the kubuntu-settings-
desktop package:

/etc/fonts/conf.d/10-sub-pixel-rgb.conf

which is pointing to:

/etc/fonts/conf.avail/10-sub-pixel-rgb.conf

Seems like the "append" still overrides the setting if the setting is
"none":

$ cat /etc/fonts/conf.d/10-sub-pixel-rgb.conf
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<!--  Enable sub-pixel rendering --> 
  <match target="pattern">
    <!--
      This configuration is available on the major desktop environments.
      We shouldn't overwrite it with "assign" unconditionally.
      Most clients may picks up the first value only. so using "append"
      may simply works to avoid it.
    -->
    <edit name="rgba" mode="append"><const>rgb</const></edit>
  </match>
</fontconfig>

** Affects: kubuntu-settings (Ubuntu)
     Importance: Undecided
         Status: New

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Bugs, which is subscribed to kubuntu-settings in Ubuntu.
https://bugs.launchpad.net/bugs/1776617

Title:
  kubuntu-settings-desktop breaks subpixel font rendering on XFCE

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