When I first tried out ispconfig on an existing F8 computer that already had a single website setup, I had similar problems with building ispconfig, and found it difficult to impossible to figure out what exactly was the error that caused the final error message. I followed the perfect server instructions and double & triple checked every step, still no go.
So I nuked everything, reinstalled a fresh Fedora 8, and installed ispconfig without any problems.
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Doug G
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