我也是同样的问题。按照二楼大神的指示，输入了指令，出来的结果如下：
xiaoyang@xiaoyang-Lenovo-M4400:~$ sudo lshw -numeric -class network
[sudo] password for xiaoyang:
*-network UNCLAIMED
description: Network controller
product: RTL8723BE PCIe Wireless Network Adapter [10EC:B723]
vendor: Realtek Semiconductor Co., Ltd. [10EC]
physical id: 0
bus info: pci@0000:07:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: latency=0
resources: ioport:6000(size=256) memory:f5d00000-f5d03fff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10EC:8168]
vendor: Realtek Semiconductor Co., Ltd. [10EC]
physical id: 0
bus info: pci@0000:0d:00.0
logical name: eth0
version: 10
serial: 3c:97:0e:ec:69:23
size: 10Mbit/s
capacity: 1Gbit/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 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168g-3_0.0.1 04/23/13 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:44 ioport:4000(size=256) memory:f5404000-f5404fff memory:f5400000-f5403fff
xiaoyang@xiaoyang-Lenovo-M4400:~$ sudo ifconfig -a
eth0 Link encap:以太网 硬件地址 3c:97:0e:ec:69:23
UP BROADCAST MULTICAST MTU:1500 跃点数:1
接收数据包:0 错误:0 丢弃:0 过载:0 帧数:0
发送数据包:0 错误:0 丢弃:0 过载:0 载波:0
碰撞:0 发送队列长度:1000
接收字节:0 (0.0 B) 发送字节:0 (0.0 B)
lo Link encap:本地环回
inet 地址:127.0.0.1 掩码:255.0.0.0
inet6 地址: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 跃点数:1
接收数据包:143 错误:0 丢弃:0 过载:0 帧数:0
发送数据包:143 错误:0 丢弃:0 过载:0 载波:0
碰撞:0 发送队列长度:0
接收字节:10687 (10.6 KB) 发送字节:10687 (10.6 KB)
xiaoyang@xiaoyang-Lenovo-M4400:~$ sudo route -nv
内核 IP 路由表
目标 网关 子网掩码 标志 跃点 引用 使用 接口
xiaoyang@xiaoyang-Lenovo-M4400:~$ sudo dhclient -v
Internet Systems Consortium DHCP Client 4.2.4
Copyright 2004-2012 Internet Systems Consortium.
All rights reserved.
For info, please visit
https://www.isc.org/software/dhcp/
No broadcast interfaces found - exiting.