Comment 4 for bug 500042

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Jean-Baptiste Lallement (jibel) wrote :

The md5sum doesn't match those of the version installed on your system. This is probably a result of the problem with your freeze issue.

Copy the files /var/lib/dpkg/info/ureadahead.* to some location for history.
remove the file /var/lib/dpkg/info/ureadahead.triggers
and run
$ sudo dpkg --purge ureadahead

If it fails with post-removal script then remove that file too.
then clean your cache
$ sudo apt-get clean
 and try performing the install of ureadahead again.