I installed ubuntu 14.04 on my notebook. I can't access internet even when i am connected to wifi. No matter how many restarts, no matter how many connections-disconnections to the network the internet access dissapears after a short period of time.
With cable works fine, so I am guessing it has something to do with wifi.
ps: I have also installed Windows and everything works great!
lspci -knn | grep Net -A2
04:00.0 Network controller : Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723] Subsystem: XAVi Technologies Corp. Device [1b9a:2485] Kernel driver in use: rtl8723be