- [jjPlus WMU6202 miniPCIe - USB - WIFI2.4/5.0GHz Bluetooth (RTL8822BU)](https://techship.com/products/jjplus-wmu6202-mpcie-usb-wifi24-50ghz-bluetooth/)
* Numerous additional products that are based on the supported chipsets
Note: Please read "supported-device-IDs" for information about how to confirm the correct driver for your adapter.
### Installation Information
The installation instructions are for the novice user. Experienced users are welcome to alter the installation to meet their needs.
Temporary internet access is required for installation. There are numerous ways to enable temporary internet access depending on your hardware and situation. [One method is to use tethering from a phone.](https://www.makeuseof.com/tag/how-to-tether-your-smartphone-in-linux) Another method to enable temporary internet access is to keep a [WiFi adapter that uses an in-kernel driver](https://github.com/morrownr/USB-WiFi) in your toolkit.
You will need to use the terminal interface. The quick way to open a terminal: Ctrl+Alt+T (hold down on the Ctrl and Alt keys then press the T key).
An alternative terminal is to use SSH (Secure Shell) from the same or from another computer, in which case you will be in a suitable terminal after logging in, but this step requires that an SSH daemon/server has already been configured. (There are lots of SSH guides available, e.g., for the [Raspberry Pi](https://www.raspberrypi.com/documentation/computers/remote-access.html#setting-up-an-ssh-server) and for [Ubuntu](https://linuxconfig.org/ubuntu-20-04-ssh-server). Do not forget [to secure the SSH server](https://www.howtogeek.com/443156/the-best-ways-to-secure-your-ssh-server/).)
You will need to have sufficient access rights to use `sudo`, so that arbitrary commands can be executed as the `root` user. (If the command `sudo echo Yes` returns "Yes", with or without having to enter your password, you do have sufficient access rights.)
DKMS is used for the installation. DKMS is a system utility which will automatically recompile and install this driver when a new kernel is installed. DKMS is provided by and maintained by Dell.
It is recommended that you do not delete the driver directory after installation as the directory contains information and scripts that you may need in the future.
There is no need to disable Secure Mode to install this driver. If Secure Mode is properly setup on your system, this installation will support it.
Note: If you do not regularly maintain your system by installing updated packages, it is a good idea to not only update system package information but also to install the updated packages followed by a system reboot. The installation can then be continued with step 3.
Warning: This step only applies if you are installing to Raspberry Pi *hardware*. You should skip this step if installing to x86 or amd64 based systems.
### Recommended WiFi Router/ Access Point Settings
Note: These are general recommendations, some of which may not apply to your specific situation.
Security: Set WPA2-AES. Do not set WPA2 mixed mode or WPA or TKIP.
Channel width for 2.4 GHz: Set 20 MHz fixed width. Do not use 40 MHz or 20/40 automatic.
Channels for 2.4 GHz: Set channel 1 or 6 or 11 depending on the congestion at your location. Do not set automatic channel selection. As time passes, if you notice poor performance, recheck congestion and set channel appropriately. The environment around you can and does change over time.
Mode for 2.4 GHz: For best performance, set "N only" if you no longer use B or G capable devices.
Network names: Do not set the 2.4 GHz Network and the 5 GHz Network to the same name. Note: Unfortunately many routers come with both networks set to the same name. You need to be able to control which network that is in use.
Channels for 5 GHz: Not all devices are capable of using DFS channels (I'm looking at you Roku.) It may be necessary to set a fixed channel in the range of 36 to 48 or 149 to 161 in order for all of your devices to work on 5 GHz. (For US, other countries may vary.)
Best location for the WiFi router/access point: Near center of apartment or house, at least a couple of feet away from walls, in an elevated location. You may have to test to see what the best location is in your environment.
Check congestion: There are apps available for smart phones that allow you to check the congestion levels on WiFi channels. The apps generally go by the name of ```WiFi Analyzer``` or something similar.
After making and saving changes, reboot the router.
### Set regulatory domain to correct setting in OS
- Moving your USB WiFi adapter to a different USB port has been known to fix a variety of problems. Problems include WiFi going on and off as well as connections coming and going.
- If connecting your USB WiFi adapter to a desktop computer, use the USB ports on the rear of the computer. Why? The ports on the rear are directly connected to the motherboard which will reduce problems with interference and disconnection that can happen with front ports that use cables.
- If your USB WiFi adapter is USB 3 capable then plug it into a USB 3 port.
- Avoid USB 3.1 Gen 2 ports if possible as almost all currently available adapters have been tested with USB 3.1 Gen 1 (aka USB 3) and not with USB 3.1 Gen 2.
- If you use an extension cable and your adapter is USB 3 capable, the cable needs to be USB 3 capable (if not, you will at best be limited to USB 2 speeds).
- Some USB WiFi adapters require considerable electrical current and push the capabilities of the power available via USB port. One example is devices that use the Realtek 8814au chipset. Using a powered multiport USB extension can be a good idea in cases like this.
### How to disable onboard WiFi on Raspberry Pi 3B, 3B+, 3A+, 4B and Zero W
Question: What interface combinations does this driver support?
Answer: None. Realtek out-of-kernel drivers, including this driver, do not
support interface combinations. If you need support for interface combinations,
I suggest adapters based on the Mediatek chipsets.
Question: What extended features does this driver support?
Answer: None. For extended features, you need an adapter that uses Mediatek or
Atheros drivers.
Question: I bought two rtl8812bu based adapters and am planning to run one of them as an AP and another as a WiFi client. How do I set that up?
Answer: You can't. Realtek drivers do not support more than one adapter with the same chipset in the same computer. However, testing has shown that the Mediatek drivers do support more than one adapter with the same chipset in the same computer.
Question: Why do you recommend Mediatek based adapters when you maintain this repo for a Realtek driver?
Answer: Many new Linux users already have adapters based on Realtek chipsets. This repo is for Linux users to support their existing adapters but my STRONG recommendation is for Linux users to seek out WiFi solutions based on Mediatek, Intel or Atheros chipsets and drivers. If users are looking at a USB solution, Mediatek and Atheros based adapters are the best solution. Realtek based USB adapters are not a good solution because Realtek does not follow Linux Wireless standards for USB WiFi adapters. Realtek drivers are problematic in many ways. You have been WARNED. For information about USB WiFi adapters:
