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Your adapter is not supported by the kernel because you installed 16.04, but not 16.04.3 on new hardware. You can upgrade the kernel by RTL8821AE wifi drivers in Ubuntu 16.04 ... controller: Realtek Semiconductor Co., Ltd. RTL8821AE 802.11ac PCIe Wireless Network Adapter. Try the generic wifi drivers as firmware-ilwifi if this solve your problem. sudo apt-get install firmware-ilwwifi reboot.