Wi-fi adapter not found after update

wi-fi adapter detected but not working after restart. here is some info

hasibul@hasibul-S551LN:~$ lspci -nnk | grep -iA2 net
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 10)
	Subsystem: ASUSTeK Computer Inc. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1043:200f]
	Kernel driver in use: r8169
	Kernel modules: r8169
03:00.0 Network controller [0280]: MEDIATEK Corp. MT7630e 802.11bgn Wireless Network Adapter [14c3:7630]
	Subsystem: Foxconn International, Inc. MT7630e 802.11bgn Wireless Network Adapter [105b:e074]
	Kernel modules: mt76x0e
04:00.0 3D controller [0302]: NVIDIA Corporation GM108M [GeForce 840M] [10de:1341] (rev a2)

Blacklist the r8169 driver and install the 8168.
sudo apt install r8168-dkms

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I am sorry it is not working now but before. I mean suddenly it is happening. I have restored the working state using rescuezilla but not working now. I have tried your command and blacklist the driver but still not working.

Screenshot from 2023-05-05 12-26-31
Screenshot from 2023-05-05 12-27-37

I'm sorry, but the image you show doesn't list r-8169 as blacklisted. As long as the 8169 is in use, the 8168 won't be loaded. The only commands i have was to install 8168, which your system already has.

This could be a failing wifi adapter. I'm dealing with the same issue with a Realtek card.

the first image shows selected as "blacklist 8169". if I am wrong, how can I blacklist that driver?

Edit that file to include a line that says "blacklist r8169" and reboot.

It will be forced to use the next available compatible driver, the 8168

i don't understand but I have done it. where is the problem?

In terminal you had typed: sudo gedit /etc/modprobe.d/blacklist.conf and added "blacklist r8169"? It's a system file and must have admin permissions to edit. Otherwise it gives you an error because it's read only.

done, but still adapter not found.
Screenshot from 2023-06-05 11-36-24
why happen this issue suddenly

What is the terminal output for

uname -a

hasibul@hasibul-S551LN:~$ uname -a
Linux hasibul-S551LN 5.15.0-73-generic #80~20.04.1-Ubuntu SMP Wed May 17 14:58:14 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

If you reboot and access the grub menu (You may need to tap the esc or the tab key) and move to Advanced options for Zorin - Select an earlier kernel, then boot from it.
Test Wifi.

This is in response to:

ok. i am doing this. please wait for me.

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done and it is working back. i did boot kernel in recovery mode and cleaned, enable the network, and repair it. but i don't understand which worked.

I suspect it was a system upgrade that introduced the later kernel. This may have had a regression or as @337harvey was aiming toward, maybe due to DKMS.

DKMS is Dynamic Kernel Module Support, which allows supporting a module even if you change the kernel. Without DKMS, upgrading the kernel will mean having to reinstall your drivers for wifi each time.

You can lock in your Current Working Kernel by following the steps here:

The clue was that you had a working wifi driver until a recent update occurred. The -73kernel was included in that.

Thanks a lot, man.

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