Having trouble setting up wifi on new system?

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Hi! First of all I’d like to say in advance that I’m sorry if this is a silly or obvious question - I’ve never seriously used a linux system before so maybe there’s just something obvious I’m not getting. That being said: I recently decided to try out manjaro after only ever really using windows, but before even installing it, I noticed that the system running off my live usb wasn’t able to connect to the internet? I’m guessing it’s a hardware issue - I don’t have a wired connection and the only way my computer has to access wifi is through a usb dongle I bought off amazon a few years back, so maybe there are some drivers that I’d need to get or something?
Assuming the issue is drivers and not something else, I have 2 questions: 1. how can I find the correct driver for my device? and 2. how can I actually get the driver onto the device and installed without an internet connection? (and I guess as a sub-question of 2, is it even possible to install drivers on a live usb or will I need to properly install manjaro first?)
I dug through my amazon history so I could link to the exact dongle I have, but apparently since I’m a new user I can’t post links? I guess I’ll just say that it’s called “BrosTrend 1200Mbps USB WiFi Network Adapter” and the last part of the url (which I think is the important bit?) is /B01BV91L7Y

Thanks in advance for any help or advice you have!

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Start the live system from the USB, and then post the output of inxi -Nazy, and lsusb, that way we can determine the suitable driver for the device.

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Okay! So I couldn’t copy & past the results directly because of the lack of internet, but I did take a photo with my phone! (edit: looks like I can’t upload media so I’ll try to retype the important bits)
result of inxi -Nazy

Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
  vendor: ASUSTeK driver: r8169 v: kernel prot f000 bus ID: 04:00.0
  chip ID: 10ec:8168
  Device-2: Realtek RTL8812AU 802.11a/b/g/n/ac 2T2R DB WLAN Adapter type: USB
  driver: usb-network bus ID: 1-2:2 chip ID: 0bda:8812 serial: <filter>

I don’t think I need to copy every single result of lsusb so here’s the one that I think corresponds to my device? I can do more if that’s not right

Bus 001 Device 002: ID 0bda:8812 Realtek Semicondoctor Corp. RTL8812AU 802.11a/b/g/n/ac 2T2R DB WLAN Adapter

Looking at this, I think what I need is a driver for the RTL8812AU? Is that right? I do see some results when I google it so at least I know it’s not a totally meaningless string :sweat_smile:
So if that’s right, how would I get the drivers for it onto my computer without an internet connection? Or am I going to have to invest in a really long ethernet cable :smile:

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There are a couple options in the AUR, you could try them and see which one works best. You need to first install other packages:

sudo pacman -Syu base-devel linuxZZ-headers

where ZZ is your kernel version (e.g. 5.4 -> 54).

Then you can run (e.g.)

pamac build rtl8812au-dkms-git

to install the selected package.

Connect an Android or iOS device via USB and turn on tethering, that should work without much hassle.

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Thank you so much for the help, this got it working! The one thing I’d mention in case anyone else reading this is a beginner like me is that when I entered the first command (sudo pacman etc.) it prompted me for which items to install (is that the right word to use?) and I just went with the default option of installing all.

This was actually a little bit of a problem because when I googled it it looked like there were also drivers required to tether to an iphone (which is what I have), but thankfully it turned out that I actually was somehow able to get access to a really long ethernet cord :sweat_smile:

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