I believe the installer version of Debian uses a newer kernel than the one it installs later, that's why your ethernet worked during installation. Sounds like a borked driver for the specific ethernet adapter and the older kernel. Get a usb-2-ethernet adapter, and retry to update the system, in case you get a newer kernel after updating it.
this post was submitted on 07 Oct 2024
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Have you verified the issue isn't a problem upstream in the network? Try plugging in a different device.
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