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I have already resolved the above by uninstalling the spreadsheet calculator... but a rename of the serpent compiler to something not widely used would prevent same issue to others down the road.
Unpacking ethereum (0.8.0+187SNAPSHOT20150102151527trusty-0ubuntu1) ...
dpkg: error processing archive /var/cache/apt/archives/ethereum_0.8.0+187SNAPSHOT20150102151527trusty-0ubuntu1_amd64.deb (--unpack):
trying to overwrite '/usr/bin/sc', which is also in package sc 7.16-3
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Processing triggers for man-db (126.96.36.199-1ubuntu1) ...
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)