我被提示从 升级16.4到16.10（edit: was just prompted to upgrade to 17.04 and same issue persists），我照做了，并接受了所有建议的删除、更新等，现在无法通过以太网访问互联网（无线仍然可以使用）。
我已经重新启动两次，并关闭/打开调制解调器，希望触发一些必要的“重新配置”。
在系统托盘中，单击无线图标时，旁边Wired只会显示unmanaged。
故障排除如下
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我尝试过（从https://askubuntu.com/a/2905/367134)：
cd /etc/NetworkManager/
sudo vim NetworkManager.conf
并改变：
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=false
到：
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq
[ifupdown]
managed=true
进而：
sudo service network-manager restart
并重新启动系统，但仍然有Wired unmanaged。
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我尝试过（从https://askubuntu.com/a/513615/367134)：
sudo ifconfig eno1 up
并重新启动系统，但仍然有Wired unmanaged。
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我尝试过（从https://askubuntu.com/a/547875/367134)：
sudo ip link set eno1 up
并重新启动系统，但仍然有Wired unmanaged。
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发现有关网络问题的其他帖子要求提供如下输出 - 以防万一它有帮助：
sudo lshw -short | grep network
/0/100/1c/0 wlp1s0 network Wireless 8260
/0/100/1f.6 eno1 network Ethernet Connection I219-V
和：
sudo lshw -C network
*-network
description: Wireless interface
product: Wireless 8260
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:01:00.0
logical name: wlp1s0
version: 3a
serial: 00:c2:c6:a1:9f:91
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=4.8.0-46-generic firmware=21.302800.0 ip=192.168.1.2 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:279 memory:df000000-df001fff
*-network DISABLED
description: Ethernet interface
product: Ethernet Connection I219-V
vendor: Intel Corporation
physical id: 1f.6
bus info: pci@0000:00:1f.6
logical name: eno1
version: 21
serial: b8:ae:ed:7e:79:73
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k firmware=0.13-4 latency=0 link=no multicast=yes port=twisted pair
resources: irq:276 memory:df100000-df11ffff
和：
lspci
00:00.0 Host bridge: Intel Corporation Skylake Host Bridge/DRAM Registers (rev 08)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520 (rev 07)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #5 (rev f1)
00:1e.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO UART Controller #0 (rev 21)
00:1e.6 SD Host controller: Intel Corporation Sunrise Point-LP Secure Digital IO Controller (rev 21)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection I219-V (rev 21)
01:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)
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内容为/etc/network/interfaces：
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
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答案1
另一篇类似的帖子得到了解决问题的答案：
https://askubuntu.com/a/905045/367134
引用答案：
作为佐尔坦·拉茨科提到，从 NetworkManager 1.2.4（ubuntu 16.10）开始，所有非 wifi/wwan 设备都被视为不受管理的（参见他在类似问题中的回答网络管理员拒绝管理有线接口）。一个解决方案是创建一个空文件：
sudo touch /etc/NetworkManager/conf.d/10-globally-managed-devices.conf...这将会覆盖/覆盖 /usr/lib 中的内容，然后重新启动网络管理器。