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I have ubuntu 20.04 and suddenly the wifi become not detected( no wifi adapter found )

i have tried with installing firmware-b43 but it gives me this error:

sudo dpkg -i firmware-b43-installer_*

(Reading database ... 311808 files and directories currently installed.) Preparing to unpack firmware-b43-installer_019-4_all.deb ... Unpacking firmware-b43-installer (1:019-4) over (1:019-4) ... Setting up firmware-b43-installer (1:019-4) ... No chroot environment found. Starting normal installation --2021-09-12 11:47:22-- http://www.lwfinger.com/b43-firmware/broadcom-wl-5.100.138.tar.bz2 Resolving www.lwfinger.com (www.lwfinger.com)... failed: Temporary failure in name resolution. wget: unable to resolve host address ‘www.lwfinger.com’ /var/lib/dpkg/info/firmware-b43-installer.postinst: Some problem occurred during the firmware download. Please check your internet connection. dpkg: error processing package firmware-b43-installer (--install): installed firmware-b43-installer package post-installation script subprocess returned error exit status 1 Errors were encountered while processing: firmware-b43-installer

, also i was about trying to solve it by the image iso of the ubuntu but the software & updater when i click on it , it does not open. .

help please !!

lspci -nnk | grep 0280 -A3

---> terminal show me :

02:00.0 Network controller [0280]: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter [168c:0042] (rev 30)
    Subsystem: Lenovo QCA9377 802.11ac Wireless Network Adapter [17aa:4035]
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL810xE PCI Express Fast Ethernet controller [10ec:8136] (rev 07)
    Subsystem: Lenovo RTL810xE PCI Express Fast Ethernet controller [17aa:381f]

sudo dmesg | grep b43

--->no response shown on the terminal

rfkill list all

---->no response shown on the terminal

Mastouri
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    First, let's troubleshoot why your wifi became not detected. Please edit your question to show the results of these terminal commands: `lspci -nnk | grep 0280 -A3` and also: `sudo dmesg | grep b43` and finally: `rfkill list all` Welcome to Ask Ubuntu. – chili555 Sep 12 '21 at 16:24
  • i have added the responses of the commands in the end of my post.Thank you – Mastouri Sep 12 '21 at 16:42
  • Since you have an Atheros wireless device, there is no need to install Broadcom firmware. Let's diagnose a bit more. Please show us: `sudo modprobe ath10k_pci` and also: `sudo dpkg -s linux-modules-extra-$(uname -r) | grep Status` – chili555 Sep 12 '21 at 18:11
  • **sudo modprobe ath10k_pci** /response was/: modprobe: FATAL: Module ath10k_pci not found in directory /lib/modules/5.11.0-34-generic ----------------------- --------------------------- **sudo dpkg -s linux-modules-extra-$(uname -r) | grep status** /response was/: dpkg-query: package 'linux-modules-extra-5.11.0-34-generic' is not installed and no information is available Use dpkg --info (= dpkg-deb --info) to examine archive files. – Mastouri Sep 12 '21 at 18:36
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    Probable duplicate: https://askubuntu.com/questions/1347951/wireless-adapter-unclaimed-after-update-and-reboot Please boot into an earlier kernel version at the GRUB menu and install linux-modules-extra-5.11.0-34-generic. – chili555 Sep 12 '21 at 19:04
  • How i could install it, install linux-modules-extra-5.11.0-34-generic and the internet not detected ? and what are the steps i should do to boot into an earlier kernel version at the GRUB menu?! I have dual boot(debian and ubuntu) can those steps if i do them at the Grub affect debian ! – Mastouri Sep 12 '21 at 19:33
  • Interrupt the boot process by pressing the right Shift key repeatedly. Under Ubuntu Advanced Options, select an earlier kernel version than 5.11.0-34. Press Enter to boot into it where your wireless will be working. then: `sudo apt install linux-modules-extra-5.11.0-34-generic` After it is finished, reboot as normal and you should be all set. – chili555 Sep 13 '21 at 14:00

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