This is filesystem corruption; the first line in your /var/lib/dpkg/status file really belongs in /var/lib/dpkg/statoverride. I'd check out whether your hard disk is dying, or failing that perhaps try a different filesystem.
** Changed in: base-installer (Ubuntu)
Status: Unconfirmed => Rejected
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dpkg: parse error
https://launchpad.net/bugs/51857
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