I've brought down a network interface with ifconfig wlan0 down, but every few hours or so, the wlan0 interface comes back up and I can't figure out why.I don't restart the machine, never changed /etc/network/interface.  I guess my question is, how would I go about just permanently disabling wlan0.  Do I use /etc/network/interface?  I already have ifconfig wlan0 down in my rc.local.
How to permanently disable a network interface?
ubuntu;networking
Method #1 - from NetworkManager's AppletTry disabling the wireless networking under the Network Applet that's accessible from under the icons in the upper right of your desktop.                                                    NOTE: The networking applet's icon looks like a triangle wedge. The image above is pointing to is as arrow #1. If you click it you should see a menu slide out from where you can disable wireless permanently, arrow #2.Method #2 - /etc/network/interfacesFrom the file /etc/network/interfaces you can specify that NetworkManager shouldn't control the wlan0 interface. To do so simply add this line to the above mentioned file:iface wlan0 inet manualThen restart NetworkManager:$ sudo service network-manager restartReferencesHow to disable built-in wifi and use only USB wifi card?