Actually I cannot reproduce this problem with
dpkg -l | grep light-themes ii light-themes 16.10+17.10.20170518-0ubuntu1 all Light Themes (Ambiance and Radiance)
could you report the light-theme version on your machine?
Actually I cannot reproduce this problem with
dpkg -l | grep light-themes 10.20170518- 0ubuntu1 all Light Themes (Ambiance and Radiance)
ii light-themes 16.10+17.
could you report the light-theme version on your machine?