I don't use vim on older systems without the ubuntu font anymore

vimrc

@@ -20,10 +20,7 @@ set spell
 syntax on
 set background=dark
 if has("gui_running")
-	" older ubuntu versions might not have this font
-	if substitute(system('lsb_release -rs'), '\n', '', '') == '12.04'
-		set guifont=Ubuntu\ Mono\ 12
-	endif
+	set guifont=Ubuntu\ Mono\ 11
 	" disable gvim toolbar
 	set guioptions-=T
 	colorscheme molokai