GNU/Linux Ubuntu 20.04 ASUS PCE-AC56 Wifi Driver Setup – Step-by-step Guide
How to Install ASUS PCE-AC56 AC1300 Wireless 802.11ac Driver for Ubuntu 20.04 Focal LTS GNU/Linux – Step by step Tutorial.
And the Ubuntu Focal ASUS PCE-AC56 Setup is based on the Broadcom BCM4352 Chipset Driver Installation.
So the linked guide explain How to Install BCM4352 Linux Driver.
In case to check your Adapter Chipset see: How to Check Wireless Device ID on GNU/Linux.
Finally, this Setup is valid for all the Ubuntu-based Distros like:
- Linux Mint
 - Zorin OS
 - Lubuntu
 - Elementary OS
 - Kde Neon
 - Pop_OS!
 - Xubuntu
 - Linux Lite
 - Bodhi
 - Puppy
 - Kubuntu
 - LXLE
 - Trisquel
 - Voyager Ubuntu
 - feren OS
 - Peppermint
 - Linux Ultimate Edition (You may just need to Discover what’s the Parent Release)
 
GNU/Linux Ubuntu 20.04 ASUS PCE-AC56 Wireless Driver Installation Guide