GNU/Linux Debian Stretch Realtek RTL8812au Driver Setup – Step-by-step Guide
How to Install Realtek RTL8812au Wireless Driver on Debian Stretch 9 GNU/Linux – Step by step Tutorial.
Especially relevant: this Realtek RTL8812au Driver Debian Stretch Setup should be working also after a Kernel Upgrade with the Dkms integration.

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1. Launching Shell Emulator
Open a Terminal window
(Press “Enter” to Execute Commands) -
2. Installing Dependencies
Then to Install Required Stuff
Run:sudo apt install build-essential linux-headers-$(uname -r) dkms unzip
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