> I have no clue which image you used and I'm not sure what you did to end up > in a situation > where the installer would try to download the grub2 packages over the net > which are actually > on the installation ISO, so they don't have to be downloaded.
The only situation where I can imagine this would happen is when the repositories have a newer version of the package than the installer image, and update to the latest version during installation is enabled (probably the default). Maybe try again, or with a different mirror? This sounds very much like a temporary issue with the repo, not the installer: Jan 4 19:00:04 in-target: 503 Backend unavailable, connection timeout [IP: 2a04:4e42:58::644 80]
