Proxmox not creating vmbr0 on install. Why? Issue?

I'm following the instructions on how to install Proxmox on Debian here - https://pve.proxmox.com/wiki/Install_Proxmox_VE_on_Debian_Jessie

I did all of the instructions, EXCEPT " Add an /etc/hosts entry for your IP address " (I skipped this part).

When logging into Proxmox, I see that Proxmox hasn't generated the vmbr0 bridge automatically.

Why is this?

How do I get Proxmox to automatically create the vmbr0 bridge while installing Proxmox?

Why did you skip adding in an entry in hosts? It's there for a reason.

There is no interactive install when you install on top of Debian Jessie, which may explain why vmbr0 was not created automatically. Look here for help setting up networking in Debian:
https://pve.proxmox.com/wiki/Network_Model
I choose the NAT option for my particular situation. I also had to edit /etc/nsswitch.conf and specifically take out the entry for "myhostname".
 
Please don't delete your questions after answers are posted, otherwise the thread becomes impossible to read and others that have the same problem will have to ask the same question again and again.