How to install Realtek RTL8723BE wifi PCIe Wireless Network Adapter [duplicate]
Solution 1:
You can get the drivers from GitHub.
Get a temporary internet connection, then open a terminal and do:
sudo apt-get install linux-headers-generic build-essential git
git clone https://github.com/lwfinger/rtlwifi_new.git
cd rtlwifi_new
make
sudo make install
sudo modprobe rtl8723be
Your wifi should now be working.