The following provides a tentative FIX to the problem, assuming gedit is installed: In /usr/share/themes/Radiance/gtk-3.20/apps create the link sudo ln -s gedit.css gnome-builder.css
The following provides a tentative FIX to the problem, assuming gedit is installed: themes/ Radiance/ gtk-3.20/ apps create the link
In /usr/share/
sudo ln -s gedit.css gnome-builder.css