New install - no network devices available - Realtek Device b822
The current Ubuntu kernel doesn't support this new adapter. You need to install a driver. Connect to the Internet and run in a terminal:
sudo apt install git dkms
git clone https://github.com/lwfinger/rtw88.git
sudo dkms add ./rtw88
sudo dkms install rtlwifi-new/0.6
Now reboot and disable Secure Boot in BIOS.
If there are any errors, please tell us in comments.