我们最近买了一台带有两个板载以太网端口的机器。但是 Ubuntu 无法在任何一个端口上识别网络。我们猜测这可能是由于驱动程序和新硬件（主板）不兼容造成的。
这是主板信息。
Base Board Information
Manufacturer: FUJITSU
Product Name: D3348-B2
Version: S26361-D3348-B2
以及两个板载以太网端口，
description: Ethernet interface
product: Ethernet Connection I217-LM
vendor: Intel Corporation
logical name: enp0s25
description: Ethernet interface
product: I210 Gigabit Network Connection
vendor: Intel Corporation
logical name: enp7s0
每当端口插入电缆时，网络图标都会尝试检测一段时间，但最终无法识别网络。代理设置在这里没有问题，因为具有相同网络配置的其他系统可以正常工作。
从终端运行ifconfig显示以下输出。
enp0s25 Link encap:Ethernet HWaddr 90:1b:0e:a9:a4:dc
inet6 addr: fe80::72c7:256d:9308:384/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4 errors:0 dropped:1 overruns:0 frame:0
TX packets:38 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:256 (256.0 B) TX bytes:5787 (5.7 KB)
Interrupt:20 Memory:fb300000-fb320000
enp7s0 Link encap:Ethernet HWaddr 90:1b:0e:e3:1e:a8
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Memory:fb100000-fb17ffff
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:268 errors:0 dropped:0 overruns:0 frame:0
TX packets:268 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:20264 (20.2 KB) TX bytes:20264 (20.2 KB)
有人可以建议是否缺少了什么或者需要调整吗？
编辑：
$ dmesg | grep -e enp -e e100
[ 2.570344] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
[ 2.570345] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[ 2.574494] e1000e 0000:00:19.0: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
[ 2.753736] e1000e 0000:00:19.0 eth0: registered PHC clock
[ 2.753740] e1000e 0000:00:19.0 eth0: (PCI Express:2.5GT/s:Width x1) 90:1b:0e:a9:a4:dc
[ 2.753742] e1000e 0000:00:19.0 eth0: Intel(R) PRO/1000 Network Connection
[ 2.753789] e1000e 0000:00:19.0 eth0: MAC: 11, PHY: 12, PBA No: FFFFFF-0FF
[ 2.754492] e1000e 0000:00:19.0 enp0s25: renamed from eth0
[ 2.804752] igb 0000:07:00.0 enp7s0: renamed from eth0
[ 13.526902] IPv6: ADDRCONF(NETDEV_UP): enp7s0: link is not ready
[ 13.573026] IPv6: ADDRCONF(NETDEV_UP): enp7s0: link is not ready
[ 13.575124] IPv6: ADDRCONF(NETDEV_UP): enp0s25: link is not ready
[ 13.781179] IPv6: ADDRCONF(NETDEV_UP): enp0s25: link is not ready
[ 16.619195] e1000e: enp0s25 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
[ 16.619236] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s25: link becomes ready
编辑2：
sudo ethtool enp0s25 | grep Link
[sudo] password for epicwl:
Link detected: yes
答案1
我也遇到过这种奇怪的事情。我通过删除旧网络设置并创建新网络设置解决了这个问题。但不确定这对您是否也有效。
1) 在右上角单击网络 > 编辑连接。您将看到如下所示的小弹出窗口。
2）删除所有网络设置。
3）重新添加并尝试连接。