My wifi adapter is not detected by ubuntu 18

Question

When I previously used Ubuntu 16 before getting Ubuntu 18 I had the issue of the computer not detecting my home wifi network.

Upgrading to Ubuntu 18 didn't solve my problem.

When I check the wifi tab in the settings it says No wifi adapter found.

ifconfig output:

enpos25: flags=4099<UP,BROADCAST,
MULTICAST> mtu 500
ether 00:19:d1:73:0f:53 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0B)
RX errors 0 dropped 0
 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped overruns 0 carrier 0 collisions 0.

lo flags=73<Up,LOOPBACK,RUNNING> mtu 65536 
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback) 
RX packets 6186 bytes 372631 (372.6 KB)
RX errors 0 dropped 0 overruns 0 frame 0 TX packets 6186 bytes 372631 (372.6 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0.

lpsci -nn | grep net output:

00:19.0 Ethernet controller [0200]: Intel corporation 82562V 10/100 Network conection [8086:104c] (rev 02). 

iwconfig output

lo no wireless extensions 
enpos25 no wireless extensions. 

Solution

I had the problem same with wifi not working in Ubuntu 16.04 Server.

Firstly, you will need to see all your available interfaces:

ifconfig -a or ip link

The one that starts with w is your wireless interface.

Next, you could try to enable it by using:

sudo ifconfig wlo1 up -- change wlo1 with your network interface name

If you get an error like Operation not possible due to RF-KILL, you will need to add the following line to /etc/modprobe.d/blacklist.conf:

blacklist wmi

After that, you enable your wifi interface:

sudo ifconfig wlo1 up

Then add the following lines to /etc/network/interfaces:

auto wlo1
iface wlo1 inet dhcp
    wpa-ssid SSID
    wpa-psk PASSWORD

Where wlo1 is the name of my wifi interface and SSID is the wifi network name and PASSWORD is the wifi pass.

Then you can check if your interface can find networks around you with:

sudo iwlist wlo1 scan -- change wlo1 with your network interface name

Then you restart the service using:

sudo service networking restart

Comments

[Jos]

There may be a hardware switch or BIOS setting that has switched the WiFi off.

[Elder Geek]

I edited your post to remove much of what I thought wasn't relevant to make it easier to read. If it no longer captures the essence of your problem feel free to roll the edit back. I highly recommend that you review askubuntu.com/questions/425155/… and then return to edit this post to provide further detail as it's missing critical information necessary to provide an accurate answer. Personally at the very least I'd like to see the output of sudo lshw -C network; rfkill list Thank you for helping us help!

[Swedish ubuntugeek]

When i type in sudo iwlist lo in the terminal it says Interface does not support scanning. And i dont see anything that starts with w but i do see the devices lo and enpos25 when typing in ifconfig-a.

[Robert Roland]

What is the output of lshw -C network? It shows your wifi card?

[Swedish ubuntugeek]

Description: Ethernet Interface product: 8526V 10 100 Network conection vendor:intel corporation

[Robert Roland]

It could be a BIOS setting that has switched it off, a hardware switch or rfkill. Have you tried rfkill list all to see if it's blocked? More info you can find here askubuntu.com/questions/425155/…

[Swedish ubuntugeek]

Its blank i dont see anything

[Swedish ubuntugeek]

description: Ethernet Interface product: 82562V 10/100 Network conection vendor intel corporation physical id 19 bus info: pci@0000:00:19.0 logical name enp0s25 version 02 serial 00: 19:d1:73:0f:53 capacity : 100 Mbit/s

[Swedish ubuntugeek]

Couldnt type out the rest because of that dumb time limit 😠😠