https://packages.ucview.com/

Run this in a terminal for Ubuntu 20.04 and above.
*** Required UCView ***
curl https://packages.ucview.com/public.gpg | gpg --dearmor | sudo tee /usr/share/keyrings/ucview-archive-keyring.gpg >/dev/null
echo "deb [signed-by=/usr/share/keyrings/ucview-archive-keyring.gpg] http://packages.ucview.com/dists/$(lsb_release -cs) ./" | sudo tee /etc/apt/sources.list.d/ucview.list
sudo apt-get update
sudo env DEBIAN_FRONTEND=noninteractive apt-get install ucview-appliance8 ucview-nginx8