installing libpng with dpkg?(without apt-get)

[Panos]

Hello. I'm new to the list and ubuntu as well. i could use some help.
i cant connect ubuntu to the internet currently. So to install software 
i download it to another system and the copy it to ubuntu. i wanted to 
install the newest libpng in universe to get libxine1rc6a  to work but 
dpkg gives me an error that it can't overwrite the .so file of the older 
libpng version. is there any way around this?

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