Re: Driver/firmware for Realtek RTL8814U WiFi USB Adapter?

[Jason Cohen <jwittlincohen@gmail.com>]

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Hi Larry,

The drivers you need are not available as a backport because no Debian
release packages said drivers.  You'll need to compile them
yourself.  However, the process should be fairly easy.

I think you want the drivers from here: https://github.com/astsam/rtl88
12au

1) This is the easy way but will only work for your existing kernel,
and presumably any future ABI compatible kernel

#Install dependencies
sudo apt-get install linux-headers-$(uname -r) build-essential git

#Clone the git repository
git clone https://github.com/astsam/rtl8812au.git 
cd rtl8812au

#Compile driver for your hardware
make RTL8814=1

#Install Module
make install

#Load Module (I compiled this myself and the created module appears to
be 8812au, not rtl8814.  If this doesn't work, just reboot with the
device connected, and it will load the correct module.)
modprobe 8812au

I don't have your hardware so I can only test the compilation, which
worked on my Debian Stretch system.  This appears to be the driver that
is used by Kali Linux, so it should work for you.

2) This method is a bit more involved but will use DKMS to ensure that
the drivers are recompiled when your kernel is updated.

#Install dependencies
sudo apt-get install linux-headers-$(uname -r) build-essential dkms git

#Set environmental variables for DKMS
DRV_NAME=rtl8814
DRV_VERSION=4.3.21

#Make directory for driver
mkdir /usr/src/${DRV_NAME}-${DRV_VERSION}

#Clone the git repository
git clone https://github.com/astsam/rtl8812au.git
/usr/src/${DRV_NAME}-${DRV_VERSION}

#Use DKMS to build and install the driver
dkms add -m ${DRV_NAME} -v ${DRV_VERSION}
dkms build -m ${DRV_NAME} -v ${DRV_VERSION}
dkms install -m ${DRV_NAME} -v ${DRV_VERSION}

Note:  I don't know if these DKMS steps will work for you since it may
compile the driver for 8812au and not 8814.  YMMV.

Sources:

Driver Source: https://github.com/astsam/rtl8812au
DKMS Instructions for rtl8812au: https://edimax.freshdesk.com/support/s
olutions/articles/14000041287-how-to-install-ew-78xx-11ac-adapter-in-
linux-with-kernel-higher-than-v4-1
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