I recommend you clean your apt cache with
$ sudo apt-get clean
This will remove the broken packages. For reading the mail use a mail user
agent, like mutt or mailx. See http://www.mutt.org/doc/manual/ for further
reading.
** Changed in: apt (Ubuntu)
Status: New => Invalid
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/etc/cron.daily/apt: Cache has broken packages, exiting
https://bugs.launchpad.net/bugs/482200
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