无法使用NetworkManager或DHCPCD连接到有线网络
这个问题非常明显。 我似乎无法连接到有线网络，只有wifi。 在网络管理器菜单下，以太网显示为灰色，并表示在下面断开连接（也显示为灰色）。 当网络管理器不工作时，我尝试了dhcpcd，它也没有用。
运行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: enp2s0 version: 15 serial: 58:20:b1:68:ff:f4 size: 10Mbit/s capacity: 1Gbit/s width: 64 bits clock: 33MHz capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=r8168 driverversion=8.043.02-NAPI duplex=half latency=0 link=no multicast=yes port=twisted pair speed=10Mbit/s resources: irq:43 ioport:4000(size=256) memory:c4204000-c4204fff memory:c4200000-c4203fff *-network description: Wireless interface product: Wireless 7265 vendor: Intel Corporation physical id: 0 bus info: pci@0000:05:00.0 logical name: wlp5s0 version: 61 serial: 5c:e0:c5:32:7f:85 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=iwlwifi driverversion=4.4.0-51-generic firmware=17.352738.0 ip=10.219.184.99 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn resources: irq:50 memory:c4000000-c4001fff
网络接口是第一个。 然后运行sudo ifconfig -a ：
enp2s0 Link encap:Ethernet HWaddr 58:20:b1:68:ff:f4 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) Interrupt:43 Base address:0xe000 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:483 errors:0 dropped:0 overruns:0 frame:0 TX packets:483 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:61916 (61.9 KB) TX bytes:61916 (61.9 KB) wlp5s0 Link encap:Ethernet HWaddr 5c:e0:c5:32:7f:85 inet addr:10.219.184.99 Bcast:10.219.255.255 Mask:255.255.0.0 inet6 addr: fe80::4d41:3774:5f38:aa9e/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:12807 errors:0 dropped:0 overruns:0 frame:0 TX packets:6470 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:15817301 (15.8 MB) TX bytes:949784 (949.7 KB)
我们可以看到enp2s0是以太网设备
接下来运行sudo ethtool enp2s0 ：
Settings for enp2s0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: 10Mb/s Duplex: Half Port: Twisted Pair PHYAD: 0 Transceiver: internal Auto-negotiation: on MDI-X: Unknown Supports Wake-on: pumbg Wake-on: g Current message level: 0x00000033 (51) drv probe ifdown ifup Link detected: no
请注意Link detected: no的Link detected: no 。 我插入了以太网电缆，似乎应该说是的。
为了完整性， lspci ：
00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09) 00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09) 00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 09) 00:04.0 Signal processing controller: Intel Corporation Broadwell-U Camarillo Device (rev 09) 00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03) 00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller #1 (rev 03) 00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev 03) 00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 (rev e3) 00:1c.2 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #3 (rev e3) 00:1c.3 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #4 (rev e3) 00:1c.4 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #5 (rev e3) 00:1c.5 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #6 (rev e3) 00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03) 00:1f.2 SATA controller: Intel Corporation Wildcat Point-LP SATA Controller [AHCI Mode] (rev 03) 00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03) 00:1f.6 Signal processing controller: Intel Corporation Wildcat Point-LP Thermal Management Controller (rev 03) 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15) 03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader (rev 01) 04:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 950M] (rev a2) 05:00.0 Network controller: Intel Corporation Wireless 7265 (rev 61)
我玩’/ etc / network / interfaces’，但最终还是把它作为auto lo lo lot环回
这应该不重要，因为我的/etc/NetworkManager/NetworkManager.conf文件如下所示：
[main] plugins=ifupdown,keyfile,ofono dns=dnsmasq [ifupdown] managed=false
我已经尝试将托管设置为true并将enp2s0添加到/etc/Network/interfaces文件，然后重新启动NetworkManager（ sudo service network-manager start/stop/reset ）
我尝试使用dhcpcd，我得到了：
no interfaces have a carrier forked to background, child pid 4994
我可以ping localhost，我可以使用无线精，DNS很好，但有线连接不起作用。 并且网卡本身可与其他已安装的操作系统（如Windows）配合使用，因此我怀疑这是一个硬件问题。
现在我将它留给StackExchange众神。 请帮忙 ：（
如果您可以临时使用WiFi或手动下载软件包，则可以尝试安装DKMS软件包：
-
sudo apt-get update -
sudo apt-get install r8168-dkms -
sudo modprobe r8168 - 重新启动计算机
手动下载：
- 请访问http://packages.ubuntu.com/xenial/all/r8168-dkms/download
- 选择你的镜像并下载
r8168-dkms_8.041.00-1_all.deb包 - 将
r8168-dkms_8.041.00-1_all.deb软件包复制到目标计算机 -
sudo dpkg -i r8168-dkms_8.041.00-1_all.deb -
sudo modprobe r8168 - 重新启动计算机