Problems with fonts when starting root

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Couldn't find font "-adobe-helvetica-medium-r-*-*-10-*-*-*-*-*-iso8859-1"

Hi, All Every time I open ROOT, this warning is at the first line: Couldn’t find font "-adobe-helvetica-medium-r---10-----*-iso8859-1" Though I have not met any problems caused by it so far, I think it’s better to fix it anyway. However, I don’t know how to do, so I turn to you for help. Thank you! Details: [code]Couldn’t find font “-adobe-helvetica-medium-r---10-----*-iso8859-1”, trying “fixed”. Please fix your system so helvetica can be found, this font typically is in the rpm (or pkg…