Proxmox VE 7.4 cannot be installed

Hello, I just tried the one and when I try to install it I get the error (you can see it in the picture)
"To start, you’re going to need an environment on which you can build the image. Ubuntu makes this pretty straightforward, so we’ll use that for this tutorial."

So, are you using Ubuntu for your base image?

I reckon, looking at that screenshot of yours, you are attempting to install those tools on Debian; or even proxmox itself.
 
"To start, you’re going to need an environment on which you can build the image. Ubuntu makes this pretty straightforward, so we’ll use that for this tutorial."

So, are you using Ubuntu for your base image?

I reckon, looking at that screenshot of yours, you are attempting to install those tools on Debian; or even proxmox itself.
I don't get it, I want to use Debian not Ubuntu whatever that is.