First, the preparations
due to the pre-configured no Internet access, no condition connect the network cable, so using a mobile phone Bluetooth / USB or Bluetooth to share a notebook wifi, very slow, less than 50kb / s, but enough.
First PCI-E interface is inserted into the PCI-E slot, no separate 1x my side slot, then use the card slot 8x.
Second, the driver installation
drive is the official website of older, only supports 4.1 kernel, and mine was 5.0, so do the driving.
I later found that the V1 version, even Linux drivers are not, but out of the way.
Beginning to find this driver: https://github.com/brektrou/rtl8821CU, to support the kernel version 5.2, and can not network .
But try not work (it may for reasons I did not restart)
Later found https://askubuntu.com/questions/1150088/problems-installing-a-tl-wn881nd-driver-on-ubuntu-18-04
press operation answering to do, or not.
The final restart, connect the antenna, ok, I do not know which step to be done.