Realtek 8814AU USB WiFi driver.
This is a temporary fork that merges updates from tpircher:devices and the Ubuntu 17.10-specific work that HomerSp has done.
Once 18.04 comes out (and tpircher merges in the devices branch) we can probably switch to using tpircher's master instead.
From your src dir
sudo cp -R . /usr/src/rtl8814au-4.3.21
sudo dkms build -m rtl8814au -v 4.3.21
sudo dkms install -m rtl8814au -v 4.3.21
This should keep your 8814AU adapter working post kernel updates.