Ubuntu: ASUS Notebook F555LA-AB31 cannot connect wifi


I just bought ASUS Notebook F555LA-AB31 Core I3-5010U 4G 500G Intel HD DVDRW 15.6in.

The weird issue is I cannot connect wifi both on Ubuntu 14.04.5 and Ubuntu 16.04.03.

I change the windows 10 to Ubuntu 16.04 after I got it, it works fine for 2 weeks. After that, it always cannot connect to wifi. I tried many ways from Internet, it doesnot work. So, I change to Ubuntu 14.04, it has same problem. Then, I bring my laptop to fix, they said hardware is good.

After I run lspci -knn | grep Net -A3; rfkill list

03:00.0 Network controller [0280]: 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  

1: phy0: Wireless LAN

Soft blocked: no    Hard blocked: no  

2: hci0: Bluetooth

Soft blocked: no    Hard blocked: no  

Additionally, I also cannot connect Ethernet, So I cannot download any software. I have no idea how to fix it, could someone give me some experienced help. I will appreciate you any help!!

Many thanks!

Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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