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ROS Electric is very old; it shouldn't be possible to install it on Ubuntu 14.04. Did you upgrade this computer from a previous version of Ubuntu?

On 14.04, the recommended ROS versions are Indigo and Jade.

It sounds like apt is in a bad state on your computer; some kind of package conflict. Sometimes sudo apt-get install -f can fix this automatically, but usually it requires some manual work. If you edit your question to include the full error message from apt, and some more information about how you got here, I can help you debug further.

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