Seems you have a problem with firmware-b43-installer package. Try typing the 
following command in a terminal:
sudo apt-get remove --purge firmware-b43-installer 

Please test if you have still wifi connection and tell us if the issue
is still present.

Thanks in advance

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https://bugs.launchpad.net/bugs/700332

Title:
  unable to install programs in software center and ones that are downloaded

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