在 Ubuntu 16.04 LTS 版本中，直到昨天我才获得 LAN 连接。现在当 LAN 线连接到端口时它不显示。端口中的灯像以前一样闪烁。
ifconfig -a
输出结果如下：
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:1213 errors:0 dropped:0 overruns:0 frame:0
TX packets:1213 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:97282 (97.2 KB) TX bytes:97282 (97.2 KB)
wlo1 Link encap:Ethernet HWaddr 44:6d:57:b8:3b:a2
inet addr:192.168.0.18 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::602:739c:2a9f:19c2/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5779 errors:0 dropped:0 overruns:0 frame:0
TX packets:4805 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4504918 (4.5 MB) TX bytes:1078354 (1.0 MB)
eth0没有显示，也没有检测到其他以太网设备接口。我在 Ubuntu 16.10 的实时会话中尝试了同样的操作，返回的输出如下洛和wlo1仅有的。
更新
输出串行通信如下：
00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4)
00:1c.2 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 3 (rev c4)
00:1c.3 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 4 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM75 Express Chipset LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller (rev 04)
02:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01)
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5229 PCI Express Card Reader (rev 01)
结论
我的以太网适配器可能已损坏。