我正在运行 Ubuntu 18.04.4 LTS，以 Cinnamon 作为桌面环境。
昨天我的以太网连接断开了，现在我无法再使用互联网；在 Chromium 上，错误是 DNS_PROBE_FINISHED_NO_INTERNET。但是，在我的网络管理器中，我仍然连接到“有线连接 1”。
我应该采取哪些步骤来诊断问题出在哪里？我需要提供更多信息吗？我不熟悉网络。我目前正在使用移动调制解调器作为替代品。
谢谢！
可能有用的各种命令的输出：
ifconfig-enp10s0 是存在问题的以太网。
enp10s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.7 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fd80::d95c:db70:d668:7afc prefixlen 64 scopeid 0x0<global>
inet6 fd80::2de8:4bea:acf9:bc9a prefixlen 64 scopeid 0x0<global>
inet6 fe80::2618:40ca:20d3:6055 prefixlen 64 scopeid 0x20<link>
ether 70:85:c2:55:07:64 txqueuelen 1000 (Ethernet)
RX packets 2134 bytes 163311 (163.3 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1895 bytes 168216 (168.2 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 2864 bytes 234021 (234.0 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2864 bytes 234021 (234.0 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
路线
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default _gateway 0.0.0.0 UG 20100 0 0 enp10s0
link-local 0.0.0.0 255.255.0.0 U 1000 0 0 enp10s0
192.168.1.0 0.0.0.0 255.255.255.0 U 100 0 0 enp10s0
ping -c4 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
From 192.168.1.1 icmp_seq=1 Destination Net Unreachable
From 192.168.1.1 icmp_seq=2 Destination Net Unreachable
From 192.168.1.1 icmp_seq=3 Destination Net Unreachable
From 192.168.1.1 icmp_seq=4 Destination Net Unreachable
--- 8.8.8.8 ping statistics ---
4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3035ms
sudo ethtool enp10s0
Settings for enp10s0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Link partner advertised pause frame use: Symmetric
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 1000Mb/s
Duplex: Full
Port: MII
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
drv probe ifdown ifup
Link detected: yes
路由
default via 192.168.1.1 dev enp10s0 proto dhcp metric 20100
169.254.0.0/16 dev enp10s0 scope link metric 1000
192.168.1.0/24 dev enp10s0 proto kernel scope link src 192.168.1.7 metric 100