ubuntu18.0.4 wireless LAN Internet can not solve!

NIC is:Qualcomm Atheros QCA6174 802.11ac Wireless Network

Wireless card no Internet access

Problem Description : After installing the wireless network card ubuntu18 normal, then after installation do not know what some operations like NVIDIA drivers on the net Why can not a wireless network card, display adapter is not found. I tried the following way:

1. Suspected driver problem, because just the installation of a wireless network card can be used, may be driven out of the question, so I follow the Internet, he said in ubuntu image file of the pool directory reinstalled dkms and bcm drive. Restart find the problem remains.
2. Ubuntu18 NIC driver is suspected of instability can not support my card. So according to the Internet , said the installation bcmwl-kernel-source. After the restart discovered the problem remains. This time may be aware that the network card driver is normal, but can not open it, because there can see the wifi icon wifi network but can not open it.
3. Use rfkill list allView findings:

0: dell-rbtn: Wireless LAN
	Soft blocked: yes
	Hard blocked: yes
1: hci0: Bluetooth
	Soft blocked: yes
	Hard blocked: no
2: phy0: Wireless LAN
	Soft blocked: no
	Hard blocked: no

See Soft block and Hard block are no. Both hard and soft switch should radio network is turned on. Thus in accordance with this use the command sudo modprobe -r dell-rbtnto remove dell-rbtnthe module. Network to open. Of course, the restart will fail, the module may be placed above the blacklist sudo vim /etc/modprobe.d/blacklist.conf, add:

blacklist dell-rbtn

Note that my laptop is a dell, laptop needs a different set of different modules, which prevail in accordance with the output rfkill

The last time installation ubuntu16 did not had this problem, you can use directly after installation has been good. Later recalled the time might think the problem is that when installed using leagcy installed, but found it impossible to start after installation. It is then provided to uefi. And then found install, update the card must enter a password. Probably because this has led to the installation of the driver does not take effect. Then after setting off uefi secure boot and 3 according to the above method has been successfully connected to the wifi.

Wireless network management

• View available WIFInmcli dev wifi
• Command line link WIFInmcli dev wifi connect WIFI名称 password WIFI密码