The Unnecessary Wireless Daemon
In Ubuntu (and most Linux distributions), the wpa_supplicant service is the core daemon responsible for handling wireless network authentication. If you are using a laptop with Wi-Fi, this service is essential for negotiating WPA/WPA2 handshakes and connecting to your router.
However, if you are running an Ubuntu Server in a data center, or if you have a desktop PC that relies exclusively on a hardwired Ethernet connection (and doesn’t even have a Wi-Fi card installed), the wpa_supplicant daemon is entirely useless. It sits in the background, consuming a small amount of memory, waiting for wireless interfaces that do not exist. You can safely disable it on wired-only machines.
How to Disable the WPA Supplicant Service
You can stop and disable the wireless daemon using systemctl.
- Open your Ubuntu Terminal (or connect via SSH).
- First, stop the service if it is currently running:
sudo systemctl stop wpa_supplicant.service- Next, disable the service so it does not attempt to start automatically on the next boot:
sudo systemctl disable wpa_supplicant.service- Because network managers (like NetworkManager) often try to automatically wake up wireless services if they detect *any* networking activity, you must mask the service to ensure it remains permanently dead:
sudo systemctl mask wpa_supplicant.serviceYour wired Ethernet connections will continue to function perfectly via systemd-networkd or NetworkManager, but your system will no longer waste resources running wireless authentication daemons.