display: unable to load font `-*-helvetica-medium-r-normal--12-*-*-*-*-*-iso8859-1'.
方案一(个人推荐)：
apt-get install xfonts-75dpi xfonts-100dpi
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方案二：
> I think that you can get 'gm display' to work by running it > like > > gm display -font > '-misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso8859-1' > > or just > > gm display -font 'fixed' It WORKS!