Maybe the package is corrupt. Check the MD5 sum:
$ md5sum /var/cache/apt/archives/dpkg_1.15.3.1ubuntu1_i386.deb
The output must be:
db7571063a3146bba596d61a8f823602 if your system is 32 bits
or
8b994e7dc5d5ddb16aacfd1c0a9016df if your system is 64 bits
If not so, there is a bug in the package.
** Changed in: dpkg (Ubuntu)
Status: New => Incomplete
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package dpkg 1.14.24ubuntu2 failed to install/upgrade:
https://bugs.launchpad.net/bugs/397498
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