Wifi Not detected in 20.04

Question

I am new to Ubuntu 20.04.

I was using windowsXP and i did a dual boot in my pc.

It looks everything is good but i am not able to detect wifi connection.

$ iwconfig
enp7s0    no wireless extensions.
lo        no wireless extensions.

and

lspci -knn
ETHERNET CONTROLLER [0200]: Intel Corporation PRO/100 VE Network Connection [8086:1092] (rev 02)
Subsystem: Hewlett-Packard Company PRO/100 VE Network Connection [103c:30bb]
Kernel driver in use: e100
Kernel modules: e100

I read responses to similar thread and some suggested installing bcmwl-kernel-source
On trying that I get an error :

Unable to locate package bcmwl-kernel-source

$ lspci -knn | grep Net; rfkill list
02:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4311 802.11b/g WLAN [14e4:4311] (rev02)
05:08.0 Ethernet controller [0200]: Intel Corporation PRO/100 VE Network Connection [8086:1092] (rev 02)
Subsystem: Hewlett-Packard Company PRO/100 VE Network Connection [103c:30bb]
0: hp-wifi Wireless LAN
      Soft blocked: no
      Hard blocked: no

Please [edit] your question and add output of lspci -knn | grep Net; rfkill list terminal command. — Pilot6, Jul 01 '20 at 17:24
Connect to the internet using e.g. your phone and install firmware-b43-installer — Pilot6, Jul 01 '20 at 17:38
You might need to run sudo apt-add-repository universe && sudo apt update first and then run sudo ubuntu-drivers autoinstall — jackw11111, Jul 01 '20 at 19:21

score 2 · Answer 1 · answered Jul 01 '20 at 17:35

2

You have BCM4311 wireless. You will need wired Internet connection to fix it.
Open Terminal and type: sudo apt install b43-fwcutter firmware-b43-installer
Then reboot.

answered Jul 01 '20 at 17:35

lev258

281

It says Unable to locate package b43-fwcutter Unable to locate package firmware-b43-installer – Hagrid Jul 01 '20 at 17:38
I says that because you are not connected to the internet. – Pilot6 Jul 01 '20 at 17:39
1

@lev248 You don't need to include b43-fwcutter to the command It will be pulled by firmware-b43-installer. – Pilot6 Jul 01 '20 at 17:40
understood , but then how do i connect to internet ? you had suggested using phone , do you mean by using usb connector ? – Hagrid Jul 01 '20 at 17:41
You can use USB, or a cable connection. There is also an offline guide in the linked answer. https://askubuntu.com/a/1244412/167850 – Pilot6 Jul 01 '20 at 17:54
I had the same problem with a HP dv6000 with the Broadcom 4311. No dual boot just loaded Linux Mint 19.3.and annihilated Vista. Everything went fine with the Ethernet connection but it did not find my WiFi. Spent hours researching and downloading suggested fixes which changed the configuration of my system. Finally yesterday decided to restore to my original config by using Time shift. Today I did what Lev258 suggested and it worked. Even though I had used that command a couple of times before it didn't work because I had changed the configuration of the original download. – bru Jul 02 '20 at 23:00

Wifi Not detected in 20.04

1 Answers1