我正在使用 Ubuntu 20.04.6，并且一直遇到间歇性 Wi-Fi 断开连接的情况，在此期间我的 Wi-Fi 图标变成问号。
在我的WIFI自动重新连接之前，我能够获得以下所有信息：
输出
ifconfig -a：eno1: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether ec:8e:b5:45:a7:27 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) 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 96567 bytes 8206625 (8.2 MB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 96567 bytes 8206625 (8.2 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 wlo1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.0.20 netmask 255.255.255.0 broadcast 192.168.0.255 inet6 2606:a800:cf85:1a00:76e6:5d29:86fc:8d7e prefixlen 64 scopeid 0x0<global> inet6 fe80::20fc:fa07:8117:1c33 prefixlen 64 scopeid 0x20<link> inet6 2606:a800:cf85:1a00:c56d:f38c:137a:80e1 prefixlen 64 scopeid 0x0<global> ether 40:49:0f:48:d6:94 txqueuelen 1000 (Ethernet) RX packets 1558979 bytes 1007454192 (1.0 GB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 918856 bytes 168900180 (168.9 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0输出
ping 192.168.0.1（这是我的路由器的 IP）：PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data. From 192.168.0.20 icmp_seq=1 Destination Host Unreachable From 192.168.0.20 icmp_seq=2 Destination Host Unreachable From 192.168.0.20 icmp_seq=3 Destination Host Unreachable From 192.168.0.20 icmp_seq=4 Destination Host Unreachable ^C --- 192.168.0.1 ping statistics --- 6 packets transmitted, 0 received, +4 errors, 100% packet loss, time 5065ms pipe 3输出
service network-manager status：● NetworkManager.service - Network Manager Loaded: loaded (/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled) Active: active (running) since Sat 2023-12-09 15:42:03 EST; 7h ago Docs: man:NetworkManager(8) Main PID: 799 (NetworkManager) Tasks: 3 (limit: 4485) Memory: 10.2M CGroup: /system.slice/NetworkManager.service └─799 /usr/sbin/NetworkManager --no-daemon Dec 09 22:54:51 ubuntu20 NetworkManager[799]: <info> [1702180491.6390] dhcp4 (wlo1): option requested_rfc3442_classless_static_routes => '1' Dec 09 22:54:51 ubuntu20 NetworkManager[799]: <info> [1702180491.6390] dhcp4 (wlo1): option requested_root_path => '1' Dec 09 22:54:51 ubuntu20 NetworkManager[799]: <info> [1702180491.6391] dhcp4 (wlo1): option requested_routers => '1' Dec 09 22:54:51 ubuntu20 NetworkManager[799]: <info> [1702180491.6391] dhcp4 (wlo1): option requested_static_routes => '1' Dec 09 22:54:51 ubuntu20 NetworkManager[799]: <info> [1702180491.6392] dhcp4 (wlo1): option requested_subnet_mask => '1' Dec 09 22:54:51 ubuntu20 NetworkManager[799]: <info> [1702180491.6392] dhcp4 (wlo1): option requested_time_offset => '1' Dec 09 22:54:51 ubuntu20 NetworkManager[799]: <info> [1702180491.6392] dhcp4 (wlo1): option requested_wpad => '1' Dec 09 22:54:51 ubuntu20 NetworkManager[799]: <info> [1702180491.6393] dhcp4 (wlo1): option routers => '192.168.0.1' Dec 09 22:54:51 ubuntu20 NetworkManager[799]: <info> [1702180491.6393] dhcp4 (wlo1): option subnet_mask => '255.255.255.0' Dec 09 22:54:51 ubuntu20 NetworkManager[799]: <info> [1702180491.6393] dhcp4 (wlo1): state changed extended -> extended输出
iwconfig：wlo1 IEEE 802.11 ESSID:"patawad" Mode:Managed Frequency:2.437 GHz Access Point: C0:C5:22:4C:9E:D0 Bit Rate=54 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr=2347 B Fragment thr:off Power Management:off Link Quality=64/70 Signal level=-46 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:4 Missed beacon:0输出
nmcli dev wifi：IN-USE BSSID SSID MODE CHAN RATE SIGNAL BARS SECURITY * C0:C5:22:4C:9E:D0 patawad Infra 6 54 Mbit/s 100 ▂▄▆█ WPA1 WPA2 94:18:65:49:D5:1B skeetswifi_2GEXT Infra 6 270 Mbit/s 67 ▂▄▆_ WPA2 6C:AE:F6:C5:CC:64 9755a8 Mesh 6 270 Mbit/s 67 ▂▄▆_ WPA3 6C:AE:F6:C5:CC:67 skeetswifi Infra 6 270 Mbit/s 67 ▂▄▆_ WPA2 6C:AE:F6:C5:CC:6A -- Infra 6 270 Mbit/s 67 ▂▄▆_ --最后，12 月 09 日 21:22:35 发生故障之前的网络日志（
<warn>)：$ sudo journalctl -b 0 -u NetworkManager Dec 09 21:09:51 ubuntu20 NetworkManager[799]: <info> [1702174191.6197] dhcp4 (wlo1): option routers => '192.168.0.1' Dec 09 21:09:51 ubuntu20 NetworkManager[799]: <info> [1702174191.6198] dhcp4 (wlo1): option subnet_mask => '255.255.255.0' Dec 09 21:09:51 ubuntu20 NetworkManager[799]: <info> [1702174191.6198] dhcp4 (wlo1): state changed extended -> extended Dec 09 21:22:35 ubuntu20 NetworkManager[799]: <warn> [1702174955.9205] sup-iface[0x557d363c1920,wlo1]: connection disconnected (reason -4) Dec 09 21:22:35 ubuntu20 NetworkManager[799]: <info> [1702174955.9537] device (wlo1): supplicant interface state: completed -> disconnected Dec 09 21:22:35 ubuntu20 NetworkManager[799]: <info> [1702174955.9538] device (p2p-dev-wlo1): supplicant management interface state: completed -> disconnected Dec 09 21:22:36 ubuntu20 NetworkManager[799]: <info> [1702174956.0225] device (wlo1): supplicant interface state: disconnected -> scanning Dec 09 21:22:36 ubuntu20 NetworkManager[799]: <info> [1702174956.0228] device (p2p-dev-wlo1): supplicant management interface state: disconnected -> scanning Dec 09 21:22:36 ubuntu20 NetworkManager[799]: <info> [1702174956.9985] device (wlo1): supplicant interface state: scanning -> authenticating Dec 09 21:22:36 ubuntu20 NetworkManager[799]: <info> [1702174956.9986] device (p2p-dev-wlo1): supplicant management interface state: scanning -> authenticating
为何我的 Wi-Fi 会断开连接？
答案1
根据输出的这一片段来判断iwconfig：
wlo1 IEEE 802.11 ESSID:"patawad" Mode:Managed Frequency:2.437 GHz Access Point: C0:C5:22:4C:9E:D0 Bit Rate=54 Mb/s Tx-Power=20 dBm
看来你正在运行 2.4GHz、54Mb/s，这相当于IEEE 802.11g-2003（WiFi 3）。
这个标准已经有 20 年的历史了，出于安全和性能原因，我强烈建议您将 WiFi 接入点升级到至少 WiFi 5 或 6，这将更好地适用于包括 Ubuntu 在内的现代系统。