我安装了 Ubunutu 18.04，一切正常。昨天，突然我的以太网端口上的灯一直亮着，即使重新启动时也亮着。每当我将以太网电缆的一端连接到它时，灯就会熄灭。
问题是什么？如何解决？
一些有用的输出
$ sudo lshw -C network
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
logical name: eno1
version: 15
serial: 80:e8:2c:71:07:dd
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 firmware=rtl8168h-2_0.0.2 02/26/15 latency=0 link=no multicast=yes port=MII
resources: irq:16 ioport:4000(size=256) memory:a4204000-a4204fff memory:a4200000-a4203fff
*-network
description: Wireless interface
product: RTL8821CE 802.11ac PCIe Wireless Network Adapter
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlo1
version: 00
serial: dc:f5:05:d0:aa:9b
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rtl8821ce ip=192.168.1.17 latency=0 multicast=yes wireless=IEEE 802.11bgn
resources: irq:129 ioport:3000(size=256) memory:a4100000-a410ffff
$ lspci
00:00.0 Host bridge: Intel Corporation Device 3e34 (rev 0c)
00:02.0 VGA compatible controller: Intel Corporation Device 3ea0 (rev 02)
00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 0c)
00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th Gen Core Processor Gaussian Mixture Model
00:12.0 Signal processing controller: Intel Corporation Device 9df9 (rev 30)
00:14.0 USB controller: Intel Corporation Device 9ded (rev 30)
00:14.2 RAM memory: Intel Corporation Device 9def (rev 30)
00:16.0 Communication controller: Intel Corporation Device 9de0 (rev 30)
00:17.0 RAID bus controller: Intel Corporation 82801 Mobile SATA Controller [RAID mode] (rev 30)
00:1c.0 PCI bridge: Intel Corporation Device 9dbc (rev f0)
00:1d.0 PCI bridge: Intel Corporation Device 9db0 (rev f0)
00:1d.1 PCI bridge: Intel Corporation Device 9db1 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Device 9d84 (rev 30)
00:1f.3 Audio device: Intel Corporation Device 9dc8 (rev 30)
00:1f.4 SMBus: Intel Corporation Device 9da3 (rev 30)
00:1f.5 Serial bus controller [0c80]: Intel Corporation Device 9da4 (rev 30)
01:00.0 3D controller: NVIDIA Corporation GM108M [GeForce MX110] (rev a2)
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter
$ sudo iotop -P
1 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % init splash
2 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kthreadd]
3 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcu_gp]
4 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcu_par_gp]
5 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/0:0-events]
6 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/~H-kblockd]
7 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/0:1-events]
8 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/~s_unbound]
9 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [mm_percpu_wq]
10 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [ksoftirqd/0]
11 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcu_sched]
12 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [migration/0]
13 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [idle_inject/0]
14 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [cpuhp/0]
15 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [cpuhp/1]
16 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [idle_inject/1]
17 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [migration/1]
18 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [ksoftirqd/1]
19 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/1:0-events]
20 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/~H-kblockd]
21 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [c