I am quite sure my Lenovo Thinkpad L570 has a Gigabit (1000 Mb/s) Ethernet interface. So why does the wired Network Settings say Link Speed 10 Mb/s? (Speedtests often say more than 200 Mb/s upload and download.) OK. Here comes the output of "$ sudo lshw -C network":
*-network description: Ethernet interface product: Ethernet Connection (4) I219-LM vendor: Intel Corporation physical id: 1f.6 bus info: pci@0000:00:1f.6 logical name: enp0s31f6 version: 21 serial: 98:29:a6:7d:c9:bf size: 10Mbit/s capacity: 1Gbit/s width: 32 bits clock: 33MHz capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=0.1-4 ip=192.168.0.163 latency=0 link=yes multicast=yes port=twisted pair speed=10Mbit/s resources: irq:129 memory:f2700000-f271ffff
I presume "size: 10Mbit/s" corresponds to the line "Link speed 10 Mb/s" in Ubuntu Network Settings.