In case you didn't know there is a very helpful repo out there for Proxmox helper scripts that helps you automate many of the configuration settings with Proxmox after you get things install, such as adding the repos you need for non-subscription repos, updating, and even removing the subscription nag.
You can find these scripts at the repo here: Proxmox VE Helper-Scripts. Let's look at the post install script, how do download and run it.
After you run the .sh script, it will launch the window below:
First it will ask to correct the Proxmox VE sources.
Disable PVE enterprise repositories:
Enable the pve-non subscription repository.
Correct the Ceph sources:
Add the disabled PVE test repository.
Disable the subscription nag when you log into Proxmox VE server.
Disable high availability option. This is one that if you are running a single node and don't plan on clustering, will free up resources.
Update Proxmox VE server
Reboot Proxmox VE server after updating.
The post install script for Proxmox completes successfully.
Hopefully, these screenshots show you the helpful capabilities found in the Proxmox VE server post install script. This is a great script to pull down after you finish installing a new Promxox VE Server if you want to quickly get things setup from an update repository standpoing and running updates.