Reset Linux Mint font configuration.

Run following command for Cinnamon

gsettings reset org.cinnamon.desktop.interface font-name; gsettings reset org.cinnamon.desktop.wm.preferences titlebar-font; gsettings reset org.gnome.desktop.interface monospace-font-name; gsettings reset org.nemo.desktop font; gsettings reset org.gnome.desktop.interface document-font-name

Run following command for MATE

gsettings reset org.mate.interface font-name; gsettings reset org.mate.interface document-font-name; gsettings reset org.mate.caja.desktop font; gsettings reset org.mate.Marco.general titlebar-font; gsettings reset org.mate.interface monospace-font-name

Run following command for Xfce

xfconf-query -c xsettings -p /Gtk/FontName -s "Ubuntu 10"; xfconf-query -c xfwm4 -p /general/title_font -s "Ubuntu Medium 10"