In contrast, Microsoft's Verdana was originally designed specifically for screen-rendering, and the Bitstream Vera / DejaVu family likewise. Prior to Vera, Linux users had the options of bitmap X fonts, which were fine but not scalable; or the "standard" Type1 font versions from URW (Times, Helvetica, etc) which looked fuzzy (when antialiased) or blocky (when not antialiased) on screen. Vera changed that, and (under the name DejaVu) remains the standard on most linux systems. Also, linux users commonly install the MS "core fonts", but these aren't included with distros and their legal status may be unclear (Microsoft no longer offers them for free download).
From what I have seen, the Ubuntu font renders very nicely on the screen.
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