Spacemacs recommends using source code pro as the default font, infact this is the font set in .spacemacs file. If the font is not availale it is substituted for some other alternative. To find the font in use do C-u C-x = on my mac it was using Menlo font. DejavuSansMono looks better than Source code Pro on ubuntu and I switched to it in my ubuntu system. A list of top programming fonts can be found at Top programming fonts

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