CUPSYS error during upgrade

encountered this error below? cupsys is complaining during installation...

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WARNING: The following packages cannot be authenticated!
cupsys
Install these packages without verification [y/N]? y
Preconfiguring packages ...
(Reading database ... 256527 files and directories currently installed.)
Preparing to replace cupsys 1.3.2-1ubuntu1 (using .../cupsys_1.3.2-1ubuntu4_i386.deb) ...
Ignoring nonregistered document cupsys
* Stopping Common Unix Printing System: cupsd [ OK ]
Unpacking replacement cupsys ...
dpkg: error processing /var/cache/apt/archives/cupsys_1.3.2-1ubuntu4_i386.deb (--unpack):
trying to overwrite `/usr/share/doc/libcupsys2/CREDITS.txt', which is also in package libcupsys2
dpkg-deb: subprocess paste killed by signal (Broken pipe)
* Starting Common Unix Printing System: cupsd [ OK ]
Errors were encountered while processing:
/var/cache/apt/archives/cupsys_1.3.2-1ubuntu4_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
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to solve just run sudo dpkg -i --force-overwrite /var/cache/apt/archives/cupsys_1.3.2-1ubuntu4_i386.deb