几个星期以来，我一直遇到网络超时的情况。以下是日志NetworkManager：
gru 12 11:37:24 r2d2l NetworkManager[975]: <info> [1544611044.3534] connectivity: (wlp3s0) timed out
gru 12 11:37:24 r2d2l NetworkManager[975]: <info> [1544611044.3536] connectivity: (enx803f5d098ae6) timed out
gru 12 11:37:24 r2d2l NetworkManager[975]: <info> [1544611044.3537] manager: NetworkManager state is now CONNECTED_SITE
gru 12 11:41:58 r2d2l NetworkManager[975]: <info> [1544611318.4725] manager: NetworkManager state is now CONNECTED_GLOBAL
gru 12 12:12:24 r2d2l NetworkManager[975]: <info> [1544613144.3487] connectivity: (wlp3s0) timed out
gru 12 12:12:24 r2d2l NetworkManager[975]: <info> [1544613144.3495] connectivity: (enx803f5d098ae6) timed out
gru 12 12:12:24 r2d2l NetworkManager[975]: <info> [1544613144.3495] manager: NetworkManager state is now CONNECTED_SITE
gru 12 12:16:57 r2d2l NetworkManager[975]: <info> [1544613417.1304] manager: NetworkManager state is now CONNECTED_GLOBAL
gru 12 12:16:57 r2d2l NetworkManager[975]: <info> [1544613417.1313] policy: set 'xxx 1' (wlp3s0) as default for IPv4 routing and DNS
gru 12 12:17:24 r2d2l NetworkManager[975]: <info> [1544613444.3464] connectivity: (enx803f5d098ae6) timed out
我的设备是小米笔记本 15 Pro，带 USB C 集线器。它首先在我的旧 Ubuntu 18.04 安装上启动。从那时起，我尝试了 USB 3.0 HUB、USB 3.0 有源（供电）HUB、新安装的 Ubuntu 18.04 等等。在 Windows 上一切正常，所以我很确定这是一个软件问题。我也更新了内核，但没有帮助。
您能帮我调试一下吗？我该怎么做才能修复它？