It’s known bug with rtl8723be Ubuntu driver. It’s easy to solve with installing new driver.
- First upgrade the kernel to 3.16 as shown in accepted answer at this link
- Now we have to install realtek driver. For that follow below commands :
git clone https://github.com/lwfinger/rtlwifi_new cd rtlwifi_new make make install modprobe rtl8723be
related links
- http://unix.stackexchange.com/questions/170012/rtl8723be-realtek-wifi-card-driver-not-working-on-ubuntu-14-04
- http://www.cse.iitd.ac.in/~mittal/wifi.html