Asus PCE-AC88 on Ubuntu 18.04
If it helps I can safely say this has been fixed with the latest 5.0 kernel. So all Ubuntu derivatives of 19.04 will work out of the box. I say this posting with Pop!_os 19.04 (and before that I installed Ubuntu 19.04 and Ubuntu Budgie 19.04 and they all work out the box). So pleased this is finally fixed.
Edit: ... and yes it's going at high speeds, can't test on a several hundred Mbps download/upload any more but my current internet is 70 down and 20 up and its maxing out flawlessly.
I just installed that card on Ubuntu 18.04 but it does not work out of the box. Found this related discussion with a documentation how to solve the problem: https://ubuntuforums.org/showthread.php?t=2337200
Certainly not an easy solution to apply. Will try it during the next days.
UPDATE:
Got the card working with the help of this blog entry: https://blog.cooperteam.net/post/2017-11-10-asus-ac88-wifi-on-linux/ It already contains the patched driver for the card ready to download: https://blog.cooperteam.net/brcmfmac4366c-pcie.bin
I moved the file to to my drivers:
sudo mv brcmfmac4366c-pcie.bin /lib/firmware/brcm
Rebooted - works.
UPDATE:
Drivers are so slow (slower than any cheap Wifi card) that I gave up, sold the card, and switched to Powerline.
As James Reid says:
this has been fixed with the latest 5.0 kernel.
Now we have Ubuntu 18.04.3 with 5.0.0-31 kernel. Just run:
sudo apt-get update && sudo apt-get dist-upgrade -y
to get the last kernel version.