The WiFi adapter in my son’s Dell Precision 5520 (OS Ubuntu 16.04) appears to have stopped working.
$ ip a
shows the wlan interface is no longer there
$ dpkg -l | grep wifi
shows the 8265 drivers are installed so I’m thinking the wifi adapter (Intel AC-8265) is bad. An exact replacement from NewEgg could take up to 18 days to receive; also, there appear to be updated M.2 wifi versions available. He’s a high school senior on the robotics team in the middle of competition and uses the computer daily, so I’d like to get it fixed ASAP.
Other than swapping in a known working card, how can I confirm that the issue is, in fact, the wifi adapter? Should I stick with exact replacement or use opportunity to upgrade to newer? The computer is beyond Dell warranty period.