How can I fix/repair a corrupted PDF file?

How can I fix/repair a corrupted PDF file?

Does anyone have any recommendation or procedures for repairing a corrupt PDF? When I open the file I get "There was an error opening this document. the file is damaged and cannot be repaired." There seems to be a myriad of tools out there but none that I could describe as reputable. Are there any opensource linux based solutions for this possibly?
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