Don’t waste time with this card…

Realtek has Windows drivers, but linux drivers are a bit of a mess - kinda worked before Kernel 3.10, but there was an API and IOCTL change that broke most, if not all, RealTek 802.11ac devices - and RealTek did not release updates because of the change.

There are third-party patches to fix things, but this isn’t in mainline kernel development.