Most of the time when you trying ubuntu on your personal laptops,
you may end up in wifi connectivity problem.
Here are the steps to resolve:
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go to terminal or use ctr+alt+t to open a terminal and execute the following commands,
sudo apt-get install linux-headers-generic
sudo apt-get install --reinstall bcmwl-kernel-source
sudo modprobe wl
Tested in Dell inspiron 15r 5520 - works great.
thanks to :http://askubuntu.com/questions/227394/lost-wi-fi-after-ubuntu-12-10-precise-pangolin-upgrade
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