I noticed that the update manager is missing in loki and learned that updates are now handled by AppCenter:

Loki - Where is the update manager?

I'd like to know the following:

  1. how do I know which sources/repositories are activated and how can I change this if necessary?
  2. what about choosing a mirror server? so far I've had considerably better download speeds when I selected a mirror close to me than with the standard download servers

I found out that you can get back the update manager by installing software properties:

sudo apt update
sudo apt install software-properties-gtk

This will allow you to choose the sources and servers, just like in freya and Ubuntu.

EDIT: I wasn't precise since the update manager is another application - known from freya and taking care of system and application updates. you can install that one too:

sudo apt install update-manager

However, sources and servers are managed with software-properties-gtk

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