Update fonts.conf

.config/fontconfig/fonts.conf

@@ -19,6 +19,12 @@
     <prefer><family>Inconsolata</family></prefer>
   </alias>
 
+   <!-- This sets Symbola as the final fallback font for the monospace font family. -->
+  <match target="pattern">
+        <test name="family"><string>monospace</string></test>
+        <edit name="family" mode="append"><string>Symbola</string></edit>
+    </match>
+
 </fontconfig>