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Today I got another problem to solve that is to no “Enable Wi-Fi” option in network-indicator on the top panel. So first of all we need to find out what network card is your machine includes. To check this, terminal command is:
sudo lshw
Now it will list all the information related to your laptop hardware.
In the network section, there will be name of your network card. In this case it was “rtl8723be”. So I searched about the problem and found this article:
http://askubuntu.com/questions/590414/wifi-problems-with-rtl8723be-in-ubuntu-14-04
The problem is basically there are no wireless drivers. So we need to follow steps given in the above link like:
Download the source code, make, make install, modprobe and finally add it your /etc/rc.local file and it should work.