I am using Ubuntu on a USB. When I do ifconfig, it always says "no wireless extensions" for lo and the others don't exist. When I go to settings, the WiFi settings says that I need a WiFi adapter. So far I have done the the things in the other duplicate questions, and none worked. The computer I am using is https://www.amazon.com/Lenovo-130S-11IGM-Laptop-Celeron-Windows/dp/B07RHMBGCF. If there is any more information that you need to know, just let me know.
This was the common issue in some type of laptops like hp. Below Tutorial was helped me to detect my wireless adapter. Please watch this video to recognise your wireless adapter. Follow these steps
1. Please install make command 2. ```sudo apt-get install build-essential``` 3. Please update your kernel to lates one ```sudo apt-get dist-upgrade``` Step 2: In terminal enter git clone [https://github.com/lwfinger/rtlwifi_new] Step 3: Now enter “cd rtlwifi_new”. Step 4: And now press “git checkout origin/extended -b extended”. Step 5: sudo make install Step 6: sudo modprobe -r rtl8723de Step 7: sudo modprobe rtl8723de if you got error like: modprobe: ERROR: could not insert ‘rtl8723de’: Required key not available
Above steps are included in that video Or go to this repository and follow the instructions