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Cannot make this wireless adapter work on Ubuntu 20.04... please help.

I've tried this: TP-LINK Archer T3U not working in Ubuntu 18.04 and now lsusb sees the device, but still doesn't work.

lsusb: Bus 002 Device 006: ID 2357:0138 TP-Link 802.11ac NIC

uname -r: 5.4.0-39-generic

Edit: It works on my other computer with Ubuntu 18.04 using T2U Plus driver from here: https://github.com/RinCat/RTL88x2BU-Linux-Driver

But it does not work with Ubuntu 20.04...

sudo modprobe 88x2bu: Gives nothing.

modinfo 88x2bu | grep -e version -e 0138 :

version:        v5.6.1_30362.20181109_COEX20180928-6a6a
srcversion:     9C5282368F93050B7206C8D
parm:           rtw_chip_version:int

dmesg | grep 88x2 :

[ 8087.334869] 88x2bu: loading out-of-tree module taints kernel.
[ 8087.336610] 88x2bu: module verification failed: signature and/or required key missing - tainting kernel
[ 8087.341389] usbcore: registered new interface driver rtl88x2bu
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  • Thanks @Karel, but no, I've tried that and nothing happens.
    – Carlos
    Jul 3 '20 at 15:21
  • 1
    Please edit your question to show the results of the terminal commands: lsusb and also: uname -r Welcome to Ask Ubuntu.
    – chili555
    Jul 3 '20 at 16:15
  • "But it does not work with Ubuntu 20.04" How so? Does it not compile correctly? Does it try to connect but fail? Or what? Please provide details.
    – chili555
    Jul 4 '20 at 13:29
  • "How so? " I don't know, simply nothing happens. lsusb sees the device, but it does not appear on the wifi settings.
    – Carlos
    Jul 4 '20 at 14:16
  • Please edit your question to show the result of these terminal commands: sudo modprobe 88x2bu and also: modinfo 88x2bu | grep -e version -e 0138 and, finally: dmesg | grep 88x2
    – chili555
    Jul 4 '20 at 14:44
4

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
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  • Thanks, I did both steps, but still nothing happens.
    – Carlos
    Jul 4 '20 at 16:20
  • 1
    Please show the result of these terminal commands: sudo modprobe 88x2bu and also: modinfo 88x2bu | grep -e version -e 0138 and, finally: dmesg | grep 88x2
    – chili555
    Jul 4 '20 at 18:33
  • sudo modprobe 88x2bu: Nothing. modinfo 88x2bu | grep -e version -e 0138 : version: v5.6.1_30362.20181109_COEX20180928-6a6a srcversion: 9C5282368F93050B7206C8D parm: rtw_chip_version:int dmesg | grep 88x2 : [ 5581.961733] 88x2bu: loading out-of-tree module taints kernel. [ 5581.962891] 88x2bu: module verification failed: signature and/or required key missing - tainting kernel [ 5581.967004] usbcore: registered new interface driver rtl88x2bu
    – Carlos
    Jul 4 '20 at 18:48
  • 1
    Please disable Secure Boot in the BIOS/EFI and report back.
    – chili555
    Jul 4 '20 at 19:19
  • Also, please confirm that when you did the git pull step, that you had a temporary internet connection by ethernet, tethering or someother means. Were there any errors along the way? Warnings are probably OK.
    – chili555
    Jul 4 '20 at 19:31

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