Updating after a subscription change

The Proxmox subscription level for a node can be changed at any time by simply applying a subscription key through the GUI. Different subscription levels have different natures of package updates. If a node has started with no subscription, it can always be changed to any paid subscription at any given time. After the subscription level changes, it is important to update the node accordingly so that updates related to the subscription level can be applied. In this section, we will see how to update a node if the subscription level of the node changes at any time. For example, we are assuming that the node is on no subscription and we are adding a paid-level subscription. We can upload a subscription key through the Subscription tabbed menu for a node on the Proxmox GUI. But the modification that needs to be made to activate the repository for subscription needs to be done through the CLI. To disable the free subscription-level repository, we are going...