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Disable Wireless

On any Ubuntu server, wireless needs to be disabled, if of course it is enabled.

First, let's disable the wireless network from the interface file:

sudo vi /etc/network/interfaces

Add the following line:

iface wlan0 inet manual

NetworkManager don't manage interfaces configured in the interfaces file. Replace wlan0 with the interface you want to disable, if it's not the name of the built-in interface.

Then restart network manager:

sudo service network-manager restart