switch from Arc-Dark to Adwaita-dark since Arc is now an AUR package

install/etc/skel/.config/gtk-3.0/settings.ini

@@ -1,5 +1,5 @@
 [Settings]
-gtk-theme-name=Arc-Dark
+gtk-theme-name=Adwaita-dark
 gtk-icon-theme-name=Numix
 gtk-font-name=Vera 12
 gtk-cursor-theme-name=Vimix-cursors

install/etc/skel/.gtkrc-2.0

@@ -1,4 +1,4 @@
-gtk-theme-name = "Arc-Dark"
+gtk-theme-name = "Adwaita-dark"
 gtk-icon-theme-name = "Numix"
 gtk-font-name = "Vera 12"
 gtk-cursor-theme-name = "Vimix-cursors"