Ubuntu 20.04连接路由器后无法访问互联网及路由器管理界面的问题求助

大家好，我遇到了一个非常棘手的网络问题，想请各位帮忙分析排查：

在家里的网络环境下，我的笔记本能成功连接到路由器，也能ping通路由器地址，甚至在路由器的管理后台里能明确看到笔记本已经在线，但就是没法通过笔记本打开路由器的管理界面——每次尝试都会返回404 Not Found错误，不过用手机连接同一个路由器却能正常访问管理后台。

更麻烦的是，笔记本连家里的路由器完全无法上网，用网线连接也不行。目前我只能靠手机热点才能正常访问互联网。另外我还试过连接另一台SIM卡式的路由器（类似热点设备），结果同样连不上网，但手机却能正常使用这台设备的网络。

我已经尝试过的解决方案： #

• 更新了网卡驱动（rtl8821ce）
• 查看NetworkManager实时日志，使用命令：journalctl -u NetworkManager.service -f，尝试连接家庭网络时的最新日志如下：

Mar 30 01:28:41 mete-HP-Pavilion-Laptop-14-ce3xxx NetworkManager[975]: <info>  [1680128921.0318] dhcp4 (wlo1): state changed unknown -> bound
Mar 30 01:28:41 mete-HP-Pavilion-Laptop-14-ce3xxx NetworkManager[975]: <info>  [1680128921.0359] device (wlo1): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'managed')
Mar 30 01:28:41 mete-HP-Pavilion-Laptop-14-ce3xxx NetworkManager[975]: <info>  [1680128921.0430] device (wlo1): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'managed')
Mar 30 01:28:41 mete-HP-Pavilion-Laptop-14-ce3xxx NetworkManager[975]: <info>  [1680128921.0435] device (wlo1): state change: secondaries -> activated (reason 'none', sys-iface-state: 'managed')
Mar 30 01:28:41 mete-HP-Pavilion-Laptop-14-ce3xxx NetworkManager[975]: <info>  [1680128921.0442] manager: NetworkManager state is now CONNECTED_LOCAL
Mar 30 01:28:41 mete-HP-Pavilion-Laptop-14-ce3xxx NetworkManager[975]: <info>  [1680128921.0459] manager: NetworkManager state is now CONNECTED_SITE
Mar 30 01:28:41 mete-HP-Pavilion-Laptop-14-ce3xxx NetworkManager[975]: <info>  [1680128921.0460] policy: set 'FiberHGW_ZT5S2F_5GHz' (wlo1) as default for IPv4 routing and DNS
Mar 30 01:28:41 mete-HP-Pavilion-Laptop-14-ce3xxx NetworkManager[975]: <info>  [1680128921.0472] device (wlo1): Activation: successful, device activated.
Mar 30 01:28:41 mete-HP-Pavilion-Laptop-14-ce3xxx NetworkManager[975]: <info>  [1680128921.0478] manager: NetworkManager state is now CONNECTED_GLOBAL

• 查看dmesg日志排查硬件层面错误，最新输出：

[ 1534.788017] rtw_8821ce 0000:0b:00.0: sta ce:a7:7a:44:0c:6c with macid 0 left
[ 1539.477710] wlo1: authenticate with ce:a7:7a:44:0c:6c
[ 1540.136524] wlo1: send auth to ce:a7:7a:44:0c:6c (try 1/3)
[ 1540.141082] wlo1: authenticated
[ 1540.144419] wlo1: associate with ce:a7:7a:44:0c:6c (try 1/3)
[ 1540.150071] wlo1: RX AssocResp from ce:a7:7a:44:0c:6c (capab=0x411 status=0 aid=1)
[ 1540.150105] rtw_8821ce 0000:0b:00.0: sta ce:a7:7a:44:0c:6c joined with macid 0
[ 1540.150347] wlo1: associated

• 检查防火墙状态：sudo ufw status，结果显示Status: inactive
• 修改DNS设置：试过通过WiFi GUI界面修改，也手动在/etc/resolv.conf中把nameserver设置为8.8.8.8
• 查看网络设备状态：nmcli device，输出如下：

wlo1             wifi      connected    FiberHGW_ZT5S2F_5GHz
br-07d2482755db  bridge    connected    br-07d2482755db
br-422e1e73cb6d  bridge    connected    br-422e1e73cb6d
br-b281592c535c  bridge    connected    br-b281592c535c
docker0          bridge    connected    docker0
virbr0           bridge    connected    virbr0
eno1             ethernet  unavailable  --
lo               loopback  unmanaged    --
virbr0-nic       tun       unmanaged    --

• 检查静态IP冲突：sudo arp-scan -l，未发现冲突情况
• 删除旧的网络配置文件：sudo rm /etc/NetworkManager/system-connections/*

做了这么多尝试后，我还是没能找到问题的根源——为什么手机热点能正常使用，但其他路由器都无法让笔记本上网呢？有没有大佬能给我一些排查方向或者解决方案？非常感谢！

备注：内容来源于stack exchange，提问作者Mete