To use the TP-Link TL-WN722N wireless USB adapter on a Linux system, you might need to install the appropriate drivers. As of my last update in September 2021, the TL-WN722N is supported by the open-source ath9k_htc driver, which is usually included in most Linux distributions.
Here are the steps you can follow to install the driver on a Linux system:
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Connect your TL-WN722N adapter to your Linux system.
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Update your package list:
sudo apt-get update
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Install necessary packages:
sudo apt-get install linux-headers-$(uname -r) build-essential
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Download the firmware:
wget http://wireless.kernel.org/download/htc_fw/1.3/htc_9271.fw
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Copy the firmware to the appropriate directory:
sudo cp htc_9271.fw /lib/firmware
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Unload conflicting modules:
sudo modprobe -r ath9k_htc
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Load the driver:
sudo modprobe ath9k_htc
After these steps, your TP-Link TL-WN722N adapter should be recognized and operational on your Linux system.