Ubuntu Notes
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debsums
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debsums_ is a useful utility to validate packages in a ubuntu or debian system.

Usage::

  sudo debsums -c

If this identifies any problems you can fix them using.::

  sudo apt install --reinstall <package name>

If debsums idenfifies several packages with issues, to fix all of them use::

  sudo apt install --reinstall $(dpkg -S $(debsums -c) | cut -d : -f 1 | sort -u)

For more information there is a `useful post about debsums on askubuntu`_

.. _`useful post about debsums on askubuntu`: http://askubuntu.com/questions/57682/find-and-reinstall-packages-with-corrupted-files-without-breaking-anything