this post was submitted on 19 May 2026
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Is it resolving to an IPv6 address? If so and you don't have fully working IPv6, try disabling IPv6 on Debian. I'm mentioning this as a possibility because I've personally had this issue with some new Debian installs a few times. The first few it took me more time than I'd like to admit to figure out the issue. If this is the case, then an IPv4 only mirror would avoid it, but you may have other random issues.
If it's not related to IPv6, then I'd just pick different mirrors until you find one that works. Are you able to access that fastly mirror from another device (via http)?
It used to try IPv6 but I've disabled it in some config. It worked for one time, but the next session it stopped (but it still connects via IPv4) Btw going to debian.map.fastlydns.net from a browser (as if it was a website) returns "unkown domain", while pinging it works. This seems weird.