I suspect your TP-LINK ARCHER AC600 [RTL8812AU] driver is not working for the new kernel.
As there is some confusion if it is RTL8812AU or RTL8821AU I will add both below. IT IS RESOLVED - IT SHOULD BE RTL8821AU
You could try the driver here. I think yours is on this. (8812au/8821au). However, it will involve working with sources and the ubuntu DKMs (Auto rebuild mechanism for drivers etc).
https://github.com/morrownr
Compatible Kernels
8812au
Kernels: 5.4 - 5.11 (Realtek)
Kernels: 5.12 - 6.11 (community support)
8821au
Kernels: 5.4 - 5.11 (Realtek)
Kernels: 5.12 - 6.10 (community support)
You can remove the current driver with the following command
sudo modprobe -r rtl8812au
sudo modprobe -r rtl8821au
sudo modprobe rtl8812au should re-install it
sudo modprobe rtl8821au should re-install it
DKMS
Use
dkms status
To identify the device driver (RTL8812AU/RTL8821AU) for each succesfully built kernel. Your original driver source could/will have an uninstall to uninstall it. If not then you could uninstall it as follows: -
Typical output of dkms status
rtl88XXau/X.XX.X.X, 6.8.0-41-generic, x86_64: installed
rtl88XXau/X.XX.X.X, 6.8.0-44-generic, x86_64: installed
Typical removal from the dkms. If it is removed it should also stop the driver installing but you might have to reboot to achieve this. You need to use your details of the driver you have installed but here are are some examples. (Note: Only uninstall from non-active or broken driver kernels.)
dkms remove rtl88XXau/x.x.x.x --all
dkms remove rtl88XXau/x.x.x.x -k 6.8.0-45-generic -a x86_64
Installation
Open a gnome-terminal
sudo apt update && sudo apt upgrade #normal updates
sudo apt install -y build-essential dkms git iw #Tools needed
mkdir -p ~/src #make a directory to place the sources
cd ~/src #move to directory
Select your driver
git clone https://github.com/morrownr/8812au-20210820.git
git clone https://github.com/morrownr/8821au-20210708.git
cd ~/src/8812au-20210820 #Move into sources
cd ~/src/8821au-20210708 #Move into sources
sudo ./install-driver.sh #(Note to remove it run ./remove-driver.sh).
If you are running secure boot and you have not installed a MOK key the driver will not get signed so it will not run. The instructions on the site do give some advice regarding this. (In particular the section on manual installation.)
I think it is a good idea to reboot before you starting testing.
To check the driver is installed in the dkms (for auto build when the kernel gets updated) run the following
sudo dkms status
I hope this is of some help
