[ubuntu] GIMP's missing

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http://ubuntuforums.org – Yesterday, I don;t see my GIMP in Application > Graphic anymore. And I tried to re-install the application from Software Center. But when I click install, the following information showed: Quote: This error could be caused by required additional software packages which are missing or not installable. Futhermore there could be a conflict between software packages which are not allowed to be installed at the same time. What it means? How can I solve the problem? Please guide me (Hardware)