If by "ethernet is unchecked in network control panel" you mean it's unchecked in the Network Port Configuration list, go ahead and make sure it's checked. It won't show up in the Sharing pref pane as ...
Back in the day, when Wi-Fi routers weren't as popular, you would find most people using RJ45 Ethernet cables to connect their computers to the internet. Even now, lots of users default to a wired ...
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