Why is Ubuntu 20.04 not registering ethernet on my Raspberry Pi?

When the Raspberry Pi boots up, Ubuntu 20.04 says the following:
Net: No ethernet found.
starting USB…
No working controllers found

It continues to boot up, but this means that I can not install a desktop environment on it. The ethernet port and cable work fine, and the Raspberry Pi ethernet jack lights up when the cable is plugged in. How do I get ethernet to be recognized?

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Author: techyguy2