[ubuntu] openoffice calc pdf export

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http://ubuntuforums.org – i apologize if i can't ask about particular software here in this forum but i need a serious help. i had exported the openoffice calc sheet as a pdf file earlier, it used to work well but it has been days whenever i press the icon for "directy export as a pdf", whole of openoffice calc fades and hangs there until i force kill to shut it down! any solution?? (Hardware)