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How to install WiFi on Ubuntu?

si flag

I have a desktop computer - HP, about 14 years old - with Ubuntu 21.04 installed and I want to use the wifi through fiber optics.

My problem is that the computer does not detect wifi and displays the message "no wifi adapter found".

I have searched on Google and YouTube, the solutions do not work for me. Something escapes me.

How can I install wifi on my computer?

grophies avatar
si flag
I tried the command "lsusb;lspci -nnk | grep -iA3 net", my computer returns some data in the terminal. The first one is : "Bus 001 Device 004: ID 0bda:0158 Realtek Semiconductor Corp. USB 2.0 multicard reader".
Pilot6 avatar
cn flag
What is " wifi through fiber optics"?
in flag
A wi-fi adapter is a hardware component of a wireless internet connection, it connects by radio waves to a wireless router's access point (AP). You can buy a USB based wi-fi adapter ('dongle') - you'll need to make sure it's Linux compatible and works with your USB (USB 1.1?). You might be better getting a PCI based wi-fi card. Getting really old systems to work is something you shouldn't bother with unless you want a specific challenge!
Jeremy31 avatar
ke flag
Post results from terminal for `lsusb;lspci -nnk | grep -iA3 net` I doubt that computer has wifi device installed
grophies avatar
si flag
"Wifi through fiber optics" means I use fiber optic and I want my computer which is in another room to have a wireless connection to internet by using the wifi.
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