Current Situation: With Ubuntu 16.04 LTS, wired connection is OK. While I enable Wifi, I coundn't find any conections. And I'm pretty sure the Wifi router is working since my cellphone's Wifi can connect to it.
Methods I tried:
The wireless adapter is connected since I can view it in
lspci.The device was not blocked with
rfkill.cat /etc/NetworkManager/NetworkManager.conf, the managed option under ifupdown is already 'true'.network-manager restart won't work
sudo service network-manager restart.
And finally, I run the wireless info script from this thread, hopes this has provided enough info: http://paste.ubuntu.com/23891726/
Other Backgrounds: This issue happened after I turn down my Ubuntu without properly close a openvpn connection. And this same situation happened before. That last time I didn't mannually shut down openvpn, I had a dual boot of Windows 10 and Ubuntu 16.04 LTS.
After switching to Windows and boot back to Ubuntu, I can view WiFi connections. I suppose this openvpn issue was related but no evidence in that.
edit 20170203 The OS was installed, and wifi connections resumed. Today, I was installing WinXP via virtualbox from this same Ubuntu machine. During the process, the power came down. After rebooting back, This same situation reappeared. So I compiled the Wireless card Realtek RTL8723AE driver as suggested, but still can't scan any wifi. Any further suggestion?
