未认领网络 Realtek 8100

Question

使用 Xubuntu 16.04 刷新旧电脑，但无法获得有效的有线以太网连接。

lspci -nn | grep 0200
02:0c.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL-8100/8101L/8139 PCI Fast Ethernet Adapter [10ec:8139] (rev 10)

dmesg | grep -e 8139 -e eth0
[    0.139845] pci 0000:02:0c.0: [10ec:8139] type 00 class 0x020000
[    2.487928] 8139cp: 8139cp: 10/100 PCI Ethernet driver v1.3 (Mar 22, 2004)
[    2.487939] 8139cp 0000:02:0c.0: This (id 10ec:8139 rev 10) is not an 8139C+ compatible chip, use 8139too
[    2.551661] 8139too: 8139too Fast Ethernet driver 0.9.28
[    2.551916] 8139too 0000:02:0c.0: Chip not responding, ignoring board
[    2.564542] 8139too: probe of 0000:02:0c.0 failed with error -5 

sudo lshw -C network
  *-network UNCLAIMED     
       description: Ethernet controller
       product: RTL-8100/8101L/8139 PCI Fast Ethernet Adapter
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: c
       bus info: pci@0000:02:0c.0
       version: 10
       width: 32 bits
       clock: 33MHz
       capabilities: pm cap_list
       configuration: latency=32 maxlatency=64 mingnt=32
       resources: ioport:9800(size=256) memory:feafbc00-feafbcff memory:feae0000-feaeffff 

Cat5 电缆直接插入路由器。路由器灯显示已连接。PCI 网卡有一个常亮的绿色 LED。