promised my lovely ‘no wires in the new house’, so trying to get some 5ghz wifi sorted. Doesn’t work out the box. Try this:

sudo apt-get install rtl8812au-dkms

A previous dkms git install that used to work has ceased to (maybe with v5 kernel?). dkms status shows which modules installed this way and for which kernel:

markp@markp-ThinkCentre-M91p:~$ sudo dkms status
nvidia-340, 340.107, 5.0.0-23-generic, x86_64: installed
nvidia-340, 340.107, 5.0.0-32-generic, x86_64: installed
rtl8812au, 4.3.14, 5.0.0-32-generic, x86_64: installed

This command will remove the above to ensure clean system for next attempt:

sudo dkms remove rtl8812au/4.3.14 --all