error with synaptic

[Senectus .]

I get this when I start synaptic and can't see any packages..:
E: Dynamic MMap ran out of room
E: Error occurred while processing netcat (NewFileVer1)
E: Problem with MergeList /var/lib/dpkg/status
E: The package lists or status file could not be parsed or opened.

Any idea's what's causing it, or how to fix it?

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Ubuntu Dapper 6.06
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