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我正在使用带有 KDE Plasma 的 Trisquel GNU/Linux 9（基于 Ubuntu 18.04 -- Bionic）。这个问题之前发布在 Ask Ubuntu [https://askubuntu.com/questions/1324475/ubuntu-18-04-no-longer-access-wired-internet-through-ethernet-after-kernel-upg] 上，但是无法在那里回答问题，因为它不是 Ubuntu 发行版。

我最近将 libre Linux 内核升级到 5.11.4-gnu，这需要重新启动许多系统服务。计算机重新启动后，我开始使用有线 Internet 连接再次正常工作。一段时间没有活动后，系统自行暂停。当我再次尝试重新使用互联网时，我无法让它工作。

网络管理器小程序是红色的。它列出了活动连接。虽然我已连接并插入了以太网电缆，但我无法访问 Internet。

在有关无法连接到有线网络的各种 Internet 帖子之后，我将计算机重新启动到较旧的内核版本（5.9.2-gnu），看看是否能解决问题，但它也没有。

以下是在 Konsole 中发出以下命令的结果：

$ sudo lshw -C network

*-network
       description: Ethernet interface
       product: Ethernet Connection I219-LM
       vendor: Intel Corporation
       physical id: 1f.6
       bus info: pci@0000:00:1f.6
       logical name: enp0s31f6
       version: 21
       serial: ec:21:e5:0f:3e:1f
       capacity: 1Gbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=5.9.2-gnu firmware=0.13-

以下是在 Konsole 中发出以下命令的结果：

$ systemctl status NetworkManager.service

● NetworkManager.service - Network Manager
   Loaded: loaded (/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2021-03-17 10:59:03 CDT; 14min ago
     Docs: man:NetworkManager(8)
 Main PID: 5359 (NetworkManager)
    Tasks: 3 (limit: 4915)
   CGroup: /system.slice/NetworkManager.service
           └─5359 /usr/sbin/NetworkManager --no-daemon

Mar 17 11:04:09 nvsu NetworkManager[5359]: <info>  [1615997049.4374] keyfile: add connection in-memory (c23e1caa-65dd-494c-8ca8-8a88dc74127c,"enp0s31f6")
Mar 17 11:04:09 nvsu NetworkManager[5359]: <info>  [1615997049.4404] device (enp0s31f6): state change: unavailable -> disconnected (reason 'connection-assumed', sys-iface-state: 'external')
Mar 17 11:04:09 nvsu NetworkManager[5359]: <info>  [1615997049.4450] device (enp0s31f6): Activation: starting connection 'enp0s31f6' (c23e1caa-65dd-494c-8ca8-8a88dc74127c)
Mar 17 11:04:09 nvsu NetworkManager[5359]: <info>  [1615997049.4744] device (enp0s31f6): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'external')
Mar 17 11:04:09 nvsu NetworkManager[5359]: <info>  [1615997049.4750] device (enp0s31f6): state change: prepare -> config (reason 'none', sys-iface-state: 'external')
Mar 17 11:04:09 nvsu NetworkManager[5359]: <info>  [1615997049.4753] device (enp0s31f6): state change: config -> ip-config (reason 'none', sys-iface-state: 'external')
Mar 17 11:04:09 nvsu NetworkManager[5359]: <info>  [1615997049.4754] device (enp0s31f6): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'external')
Mar 17 11:04:09 nvsu NetworkManager[5359]: <info>  [1615997049.4757] device (enp0s31f6): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'external')
Mar 17 11:04:09 nvsu NetworkManager[5359]: <info>  [1615997049.4759] device (enp0s31f6): state change: secondaries -> activated (reason 'none', sys-iface-state: 'external')
Mar 17 11:04:09 nvsu NetworkManager[5359]: <info>  [1615997049.4788] device (enp0s31f6): Activation: successful, device activated.

我应该怎么做才能让我的有线 Internet 连接重新工作？

谢谢你。

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