Fix ugly font rendering in Linux

mkdir -p ~/.config/fontconfig/conf.d/

Edit this file:
~/.config/fontconfig/conf.d/20-no-embedded.conf 

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
  <match target="font">
    <edit name="embeddedbitmap" mode="assign">
      <bool>false</bool>
    </edit>
  </match>
</fontconfig>

Ref: https://ask.fedoraproject.org/en/question/69232/how-to-fix-font-rendering-of-monaco/