As my onboard WiFi Chipset (Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) [168c:002b]) does not support the 11AC-standard, according to my research, I bought an USB-Adapter.
Following the advice given on
https://askubuntu.com/questions/923222/how-can-i-enable-a-realtek-usb-antenna
and
https://askubuntu.com/questions/787017/where-do-usb-wifi-drivers-go-16-04
I installed installed the driver provided on
https://launchpad.net/~hanipouspilot/+archive/ubuntu/rtlwifi
by adding the repository and calling
sudo apt-get install rtl8192du-dkms
However,
modprobe -c | grep -i "0bda.*ab11"
returns nothing and
usb-devices | awk '/a811/' RS=
ends with
...
I: If#= 0 Alt= 0 #EPs= 6 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
Can you please give me any hints what to do next to circle the problem?