I recently upgraded to ubuntu 16.04 and since then, whenever I connect to a Wifi network, I get a "connection established" notification from Network Manager, but when I try to access any website, I get a "no internet access" message. I've looked for this problem being solved already and there is nothing concrete. Please help.
This is the output of lspci -knn | grep Net -A2:
03:00.0 Network controller : Realtek Semiconductor Co., Ltd. RTL8821AE 802.11ac PCIe Wireless Network Adapter [10ec:8821] Subsystem: XAVi Technologies Corp. RTL8821AE 802.11ac PCIe Wireless Network Adapter [1b9a:2482] Kernel driver in use: rtl8821ae Kernel modules: rtl8821ae