lost previously working ethernet on desktop Kubuntu 20.04

My desktop ethernet connection was working fine previously, but now I get the error "IP configuration was unavailable" from NetworkManager. My wifi connection is working. If I connect my Macbook, ethernet works fine.

I've tried restarting NetworkManager and my router without successfully restoring my ethernet connection.

sudo dhclient -v enp0s25 produces:

Listening on LPF/enp0s25/b8:ae:ed:76:6b:29
Sending on   LPF/enp0s25/b8:ae:ed:76:6b:29
Sending on   Socket/fallback
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 3 (xid=0x5bcc4f20)
DHCPDISCOVER on enp0s25 to 255.255.255.255 port 67 interval 4 (xid=0x5bcc4f20)

sudo dhclient -v wlp2s0 produces:

Listening on LPF/wlp2s0/34:13:e8:30:58:b8
Sending on   LPF/wlp2s0/34:13:e8:30:58:b8
Sending on   Socket/fallback
DHCPDISCOVER on wlp2s0 to 255.255.255.255 port 67 interval 3 (xid=0x91c2e70b)
DHCPOFFER of 100.0.0.14 from 100.0.0.1
DHCPREQUEST for 100.0.0.14 on wlp2s0 to 255.255.255.255 port 67 (xid=0xbe7c291)
DHCPACK of 100.0.0.14 from 100.0.0.1 (xid=0x91c2e70b)
bound to 100.0.0.14 -- renewal in 38644 seconds.

Also, sudo lshw -C network produces:

*-network                 
       description: Ethernet interface
       product: Ethernet Connection (3) I218-V
       vendor: Intel Corporation
       physical id: 19
       bus info: pci@0000:00:19.0
       logical name: enp0s25
       version: 03
       serial: b8:ae:ed:76:6b:29
       size: 100Mbit/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=off broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=half firmware=0.2-4 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:45 memory:f7100000-f711ffff memory:f713b000-f713bfff ioport:f080(size=32)

I also booted from a live dvd of Kubuntu 20.04 and the ethernet still didn't work. Does this mean that it's likely a hardware issue?

I've done some Googling without resolving my issue. Thanks in advance for helping.