Install rtl8814AU driver on ubuntu 16.04
For some reason dkms built on the old kernel rather than the new one, in terminal do
sudo dkms remove 8814au/4.3.21 -k 4.13.0-37-generic
sudo dkms install 8814au/4.3.21
Reboot and it should work
To fix this for newer kernels
sudo apt-get install gksudo
gksudo gedit /usr/src/8814au-4.3.21/dkms.conf
Change the first line from MAKE="'make'"
to MAKE="'make' all KVER=${kernelver}"
Save and exit gedit and it should work correctly in future kernel updates