It's been improving in a lot of distros recently but it used to be that the default proportional font on most Linux distros was Vera Sans or DejaVu sans which a

It's been improving in a lot of distros recently but it used to be that the default proportional font on most Linux distros was Vera Sans or DejaVu sans which always drove me nuts because of how wide the glyphs of those fonts are compared to just about any UI font used in commercial operating systems in the past two or three decades. It was enough of a peeve that when it came to Linux distros, I used to be inclined toward Ubuntu and Ubuntu variants for the simple fact that they had Ubuntu Sans, a much better UI font, preinstalled.