TP-Link Archer T3U Plus USB adapter

Please notice at the git repository that you linked:

enter image description here

Your son is evidently using the latest (5 or less days ago) version and you are not.

Since dkms status returned nothing, we conclude that you installed with sudo make install. Let's remove the inoperative driver, update it and reinstall:

cd ~/RTL88x2BU-Linux-Driver/
sudo make uninstall
make clean
git pull
make
sudo make install
sudo modprobe 88x2bu

After each kernel update, you must recompile:

cd ~/RTL88x2BU-Linux-Driver/
make clean
git pull
make
sudo make install
sudo modprobe 88x2bu

EDIT: As we have seen, the git pull step was ineffective as you downloaded the zip file rather than obtaining the driver by git clone.

Please do:

cd ~/RTL88x2BU-Linux-Driver-master

Or whatever the name of the previously downloaded and extracted driver file is. Next:

sudo make uninstall
cd ..
sudo rm -r RTL88x2BU-Linux-Driver-master

Now. we'll download a fresh copy with updates that drive your device. With a temporary working internet connection, please do:

wget https://github.com/RinCat/RTL88x2BU-Linux-Driver/archive/master.zip
unzip master.zip
cd RTL88x2BU-Linux-Driver-master
make
sudo make install
sudo modprobe 88x2bu

TP-Link Archer T3U Plus USB adapter

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