My son has had a package update request for a couple days so this morning he ran the update. When he came back a couple hours later, he had no internet access. He set about troubleshooting and found his Linksys adapter wasn't working. He brought it to me to see what I could find out, as he thought it was toast.
I popped it in my system (Running Zorin Core 17.1) and then ran lsusb:
roy@papa:~$ lsusb
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID 0bda:b023 Realtek Semiconductor Corp. RTL8822BE Bluetooth 4.2 Adapter
Bus 003 Device 004: ID 27c6:55b4 Shenzhen Goodix Technology Co.,Ltd. Fingerprint Reader
Bus 003 Device 002: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 029: ID 174f:2426 Syntek Integrated Camera
Bus 001 Device 030: ID 13b1:0045 Linksys WUSB6300 V2
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
roy@papa:~$
as you can see it comes up in the list. However, I had already run the update this morning be he did. So as I tried to follow the instructions here on the Zorin Forum:
@chutson1 Hi
> Steps to make Linksys WUSB6300 V2 work on ZorinOs16 [ALL VERSIONS] :
>
>
>
> 1. The terminal part:
> 2.Ctrl + Alt + T** ←(Open the Terminal)*
> $ sudo apt install git dkms ←(Installs Git and DKMS)
> $ git clone https://github.com/aircrack-ng/rtl8812au.git ←(Copies the Git repositories - GitHub - aircrack-ng/rtl8812au: RTL8812AU/21AU and RTL8814AU driver with monitor mode and frame injection )
> $ cd /#where you copied it/rtl8812au ←(Goes to the place where you cloned the GitHub repo)
> $ sudo ./dkms-install.sh ←(Installs it)
> 3. Reboot:
> $ reboot / Menu → Reboot
> 4. Enjoy:
> It should work properly now 
>
>
>
> If you have any problems ask here, make sure to also give detailed information - (Copy and Paste the output if the commands don't work) (List any error you encounter). 
> Sources:
>
>
>
> * Linksys AC1200 WiFi 5 USB Adapter [SOLVED] - Linux Mint Forums
> * networking - How do I get the linksys WUSB6300 wireless adapter to work on linux - Ask Ubuntu
> * GitHub - abperiasamy/rtl8812AU_8821AU_linux: rtl8812AU_8821AU linux kernel driver for AC1200 (801.11ac) Wireless Dual-Band USB Adapter
> * Linksys Official Support - WiFi 5 USB Adapter Dual-Band AC1200 WiFi 5 USB Adapter
Hope this helps 
This is what I get on step 1:
roy@papa:~$ sudo apt install git dkms
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package git is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'git' has no installation candidate
roy@papa:~$