[ubuntu] Removing the instance/package which is not fully installed from apt-get

When I'm installing g77-3.4 for pgplot, I trivially use dkpg to install it.
However, g77-3.4-doc is not able to fully installed.
And I stuck for this kind of error due to the broken packages (refer to here):

dpkg: error processing realplayer (--configure/--purge/--remove):
(Whatever messages)
Errors were encountered while processing:
g77-3.4-doc

cd /var/lib/dpkg/info
sudo rm g77-3.4-doc*
sudo dpkg --remove --force-remove-reinstreq g77-3.4-doc

Hmm, now apt-get works well again. https://www.youtube.com/watch?v=S9HJ-iAzf3k

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