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There, I Fixed It: Lenovo X1 Carbon 6th Gen Ethernet Port + Thunderbolt Port fit : r/Lenovo
2.5GbE USB A to Ethernet Adapter – NBASE-T NIC – USB 3.0 Type A 2.5 GbE /1 GbE Multi Speed Gigabit Network – USB 3.1 Laptop to RJ45/LAN – Lenovo X1 Carbon,