Hi, I have a debien OS installed on VMware. When i do the command nano /etc/apt/sources.list, I don’t have the debian.map.fastlydns.net written in the file but as soon as I try to do apt update it tells me that debian.map.fastlydns.net can’t be reached.
What DO you have in that file? It's usually not recommended to put a mirror name directly into that file, specifically for this reason; individual mirrors sometimes are unavailable.
Instead, it's more common to use a country-wide name such as ftp.xx.debian.org (where xx is a country code). These hosts don't really exist, but are a series of redirects pointing to local hosting providers. Sometimes the list is out of date, and the redirect might take you to a host which is unavailable.
You can either wait a bit and try again, and you might get
redirected to a different host, or you can use the "new" system at
https://deb.debian.org
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