我的笔记本电脑每 5 分钟就会断开一次连接，但它始终连接到 wifi，可以正常工作（我可以从其他设备看到它可以正常工作）。我尝试使用其他浏览器，但结果是一样的，此外，我在 ssh 文件传输时也遇到了同样的连接丢失问题。
使用命令sudo journalctl --since="-2 minutes"，只需后连接崩溃，我得到：
set 10 11:11:22 acer-Aspire-A315-56 systemd-resolved[582]: Using degraded feature set UDP instead of TCP for DNS server 10.64.10.16.
set 10 11:11:27 acer-Aspire-A315-56 pkexec[4942]: pam_unix(polkit-1:session): session opened for user root by (uid=1000)
set 10 11:11:27 acer-Aspire-A315-56 pkexec[4942]: acer: Executing command [USER=root] [TTY=unknown] [CWD=/home/acer] [COMMAND=/usr/lib/update-notifie>
set 10 11:11:37 acer-Aspire-A315-56 systemd-resolved[582]: Using degraded feature set UDP instead of TCP for DNS server 10.64.10.15.
set 10 11:11:38 acer-Aspire-A315-56 systemd[1]: systemd-hostnamed.service: Succeeded.
set 10 11:11:42 acer-Aspire-A315-56 systemd-resolved[582]: Using degraded feature set TCP instead of UDP for DNS server 10.64.10.16.
set 10 11:11:55 acer-Aspire-A315-56 gnome-shell[1076]: Window manager warning: Ping serial 456584 was reused for window 0xa00006, previous use was fo>
set 10 11:12:09 acer-Aspire-A315-56 systemd-resolved[582]: Using degraded feature set TCP instead of UDP for DNS server 10.64.10.15.
set 10 11:12:29 acer-Aspire-A315-56 systemd-resolved[582]: Using degraded feature set UDP instead of TCP for DNS server 10.64.10.16.
set 10 11:12:30 acer-Aspire-A315-56 systemd-resolved[582]: Using degraded feature set UDP instead of TCP for DNS server 10.64.10.15.
set 10 11:12:35 acer-Aspire-A315-56 gnome-shell[5085]: Fontconfig error: Cannot load default config file: No such file: (null)
set 10 11:12:36 acer-Aspire-A315-56 systemd-resolved[582]: Using degraded feature set TCP instead of UDP for DNS server 10.64.10.16.
set 10 11:12:41 acer-Aspire-A315-56 systemd-resolved[582]: Using degraded feature set TCP instead of UDP for DNS server 10.64.10.15.
set 10 11:12:56 acer-Aspire-A315-56 systemd-resolved[582]: Using degraded feature set UDP instead of TCP for DNS server 10.64.10.16.
set 10 11:13:01 acer-Aspire-A315-56 systemd-resolved[582]: Using degraded feature set UDP instead of TCP for DNS server 10.64.10.15.
set 10 11:13:01 acer-Aspire-A315-56 systemd[920]: Started Application launched by gsd-media-keys.
set 10 11:13:02 acer-Aspire-A315-56 systemd[920]: Started VTE child process 5212 launched by gnome-terminal-server process 1806.
set 10 11:13:02 acer-Aspire-A315-56 gnome-shell[1076]: libinput error: event5 - USB Optical Mouse: client bug: event processing lagging behind by 25>
set 10 11:13:06 acer-Aspire-A315-56 systemd-resolved[582]: Using degraded feature set TCP instead of UDP for DNS server 10.64.10.16.
set 10 11:13:06 acer-Aspire-A315-56 sudo[5227]: pam_unix(sudo:auth): Couldn't open /etc/securetty: No such file or directory
set 10 11:13:07 acer-Aspire-A315-56 systemd-resolved[582]: Using degraded feature set TCP instead of UDP for DNS server 10.64.10.15.
set 10 11:13:09 acer-Aspire-A315-56 sudo[5227]: pam_unix(sudo:auth): Couldn't open /etc/securetty: No such file or directory
set 10 11:13:09 acer-Aspire-A315-56 sudo[5227]: acer : TTY=pts/1 ; PWD=/home/acer ; USER=root ; COMMAND=/usr/bin/journalctl --since=-2 minutes
set 10 11:13:09 acer-Aspire-A315-56 sudo[5227]: pam_unix(sudo:session): session opened for user root by (uid=1000)
我认为最相关的一行是“（...）对 DNS 服务器 10.64.10.16 使用降级功能集 UDP 而不是 TCP。“
我的 ubuntu 版本是 21.04，我的笔记本电脑是带有 WiFi 连接的 Acer Aspire 3 A315-56。