Wi-Fi problem on Lenovo z50-70 with Realtek RTL8723BE

Solution 1:

You need to install wireless driver. It can be done this way. Run in terminal these commands (one by one):

sudo apt-get install git build-essential
git clone https://github.com/lwfinger/rtlwifi_new.git
cd rtlwifi_new
make
sudo make install

You will need to re-install it after each kernel upgrade.

Solution 2:

I had the same problem with my Lenovo Z50-75 and the RTL8723BE on windows 8.1. I returned to the shop with all the information from this forum in my backpocket. They opened up my Lenevo and it turned out that the WIFI antenna was not connected to the RTL8723BE, hence poor reception and stuff. They connected it properly and everything worked fine!