Ubuntu 20.04 not linking with ethernet connection

Running Ubuntu 20.04.5. Hardware: Dell Inspiron 14R. Command-line only, no gui. No Windows partition. Wifi has been working OK although with a few hiccups here and there. Wanted to try an ethernet connection from the Google Nest router to the dell. Network interface shows up with ifconfig

enp7s0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether e0:db:55:c3:1f:6b  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

but with command ip a, it shows as down

enp7s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
    link/ether e0:db:55:c3:1f:6b brd ff:ff:ff:ff:ff:ff

Tried to bring up with "sudo ip link set enp7s0 up" but no change. Tried with both cat5 and cat6 eth cable. Ethernet connection works fine when I connect the Google Nest to a Windows laptop. Hardware info:

*-network
                description: Ethernet interface
                product: RTL810xE PCI Express Fast Ethernet controller
                vendor: Realtek Semiconductor Co., Ltd.
                physical id: 0
                bus info: pci@0000:07:00.0
                logical name: enp7s0
                version: 08
                serial: e0:db:55:c3:1f:6b
                capacity: 100Mbit/s
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
                configuration: autonegotiation=on broadcast=yes driver=r8169 firmware=rtl8106e-2_0.0.1 04/23/13 latency=0 link=no multicast=yes port=MII
                resources: irq:19 ioport:e000(size=256) memory:f7c04000-f7c04fff memory:f7c00000-f7c03fff

Anything else I should be checking?