Fixing overly strong LCD sub-pixel filtering on Debian and Ubuntu
Some people think the sub-pixel color fringing is too strong when they have sub-pixel anti-aliasing on. If your install is old enough, you might not have the correct symlinks in
sudo ln -s /usr/share/fontconfig/conf.avail/11-lcdfilter-default.conf /etc/fonts/conf.d/
… and restart X. This should fix the problem.