Mk HAP ac² and wifi card compatibility issue with Lubuntu?

Bit of a mess…can you please explain how this hAP ac2 is supposed to work? Then we can start from there, And would love to see the logging on the RB.

Besides:

In your case I would reset the RB, without configuration and then choose “HomeAP dual” from the Quickset. Get rid of WPA (choose WPA2-AES only) and continue from there.
Tip: never touch Quickset after primary config.