大家下午好。
昨天（10 月 11 日）午夜，我的笔记本电脑通过以太网电缆与互联网断开连接。我仍然可以通过 wifi 连接。
我有第二台笔记本电脑，它可以双启动 Xubuntu 19.04 和 Windows 10。第二台笔记本电脑仍然可以在 Windows 10 和 Xubuntu 19.04 中连接到以太网，所以这不是调制解调器/路由器的问题。
我曾设法通过删除自动 eth0 设置并重新配置来恢复以太网，但现在它也停止工作了（而且我无法恢复自动 eth0！）。
有人能帮助我解决这个问题吗？
@heynnema：您请求的信息。
dkms status
digimend, 8, 5.0.0-29-generic, x86_64: installed
digimend, 8, 5.0.0-31-generic, x86_64: installed
sudo lshw -C network
[sudo] password for bac:
*-network
description: Ethernet interface
product: RTL810xE PCI Express Fast Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:07:00.0
logical name: enp7s0
version: 07
serial: b0:5a:da:c9:aa:2a
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical
configuration: broadcast=yes driver=r8169 latency=0 multicast=yes
resources: irq:18 ioport:4000(size=256) memory:b4000000-b4000fff memory:b4800000-b4803fff
*-network
description: Wireless interface
product: Wireless 3165
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:0d:00.0
logical name: wlp13s0
version: 81
serial: 94:65:9c:b9:9a:ba
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=5.0.0-31-generic firmware=29.1044073957.0 ip=192.168.1.114 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:44 memory:b2000000-b2001fff
cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
cat /etc/netplan/*.yaml
cat: '/etc/netplan/*.yaml': No such file or directory
@heynnema：第二次运行 sudo lshw -C network：
*-network
description: Ethernet interface
product: RTL810xE PCI Express Fast Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:07:00.0
logical name: enp7s0
version: 07
serial: b0:5a:da:c9:aa:2a
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical
configuration: broadcast=yes driver=r8169 latency=0 multicast=yes
resources: irq:18 ioport:4000(size=256) memory:b4000000-b4000fff memory:b4800000-b4803fff
*-network
description: Wireless interface
product: Wireless 3165
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:0d:00.0
logical name: wlp13s0
version: 81
serial: 94:65:9c:b9:9a:ba
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=5.0.0-31-generic firmware=29.1044073957.0 latency=0 link=no multicast=yes wireless=IEEE 802.11
resources: irq:44 memory:b2000000-b2001fff
@heynnema：第三次魅力！
sudo lshw -C network
*-network
description: Ethernet interface
product: RTL810xE PCI Express Fast Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:07:00.0
logical name: enp7s0
version: 07
serial: b0:5a:da:c9:aa:2a
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical
configuration: broadcast=yes driver=r8169 latency=0 multicast=yes
resources: irq:18 ioport:4000(size=256) memory:b4000000-b4000fff memory:b4800000-b4803fff
*-network
description: Wireless interface
product: Wireless 3165
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:0d:00.0
logical name: wlp13s0
version: 81
serial: 94:65:9c:b9:9a:ba
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=5.0.0-31-generic firmware=29.1044073957.0 latency=0 link=no multicast=yes wireless=IEEE 802.11
resources: irq:43 memory:b2000000-b2001fff
但仍然没有自动 eth0。我怎么知道我使用的是 cat5 还是 cat6 电缆？
@heynnema：希望这是最后一个了：
sudo lshw -C network
*-network
description: Ethernet interface
product: RTL810xE PCI Express Fast Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:07:00.0
logical name: enp7s0
version: 07
serial: b0:5a:da:c9:aa:2a
size: 100Mbit/s
capacity: 100Mbit/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 autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 duplex=full firmware=rtl8106e-1_0.0.1 06/29/12 ip=192.168.1.195 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
resources: irq:18 ioport:4000(size=256) memory:b4000000-b4000fff memory:b4800000-b4803fff
*-network DISABLED
description: Wireless interface
product: Wireless 3165
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:0d:00.0
logical name: wlp13s0
version: 81
serial: 94:65:9c:b9:9a:ba
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=5.0.0-31-generic firmware=29.1044073957.0 latency=0 link=no multicast=yes wireless=IEEE 802.11
resources: irq:43 memory:b2000000-b2001fff
答案1
来自评论...
使用该命令进行长时间的故障排除后sudo lshw -C network，看起来好像没有电缆连接到计算机，或者电缆有缺陷（用户没有使用 cat 5e 或 cat 6 电缆），或者交换机/集线器/路由器/调制解调器没有连接。
确定计算机确实看到的是 enp7s0 以太网设备，而不是 eth0 设备。通过使用 enp7s0 创建一个全新的 NetworkManager GUI 连接脚本，并使用内核 -29、-30 和 -31 进行测试，一切似乎都恢复正常。使用 eth0 的旧连接脚本已被删除。
如果再次失败，您将需要启动到 Ubuntu Live DVD/USB 并重新测试以太网网络接口。