我发现我的设备最近无法通过其服务连接到ntp.ubuntu.comsystemd-timesyncd。
Mar 15 00:31:52 l157 systemd-timesyncd[673]: Timed out waiting for reply from 91.189.89.199:123 (ntp.ubuntu.com).
Mar 15 00:32:02 l157 systemd-timesyncd[673]: Timed out waiting for reply from 91.189.89.198:123 (ntp.ubuntu.com).
Mar 15 00:32:12 l157 systemd-timesyncd[673]: Timed out waiting for reply from 91.189.91.157:123 (ntp.ubuntu.com).
Mar 15 00:32:23 l157 systemd-timesyncd[673]: Timed out waiting for reply from 91.189.94.4:123 (ntp.ubuntu.com).
ntp.ubuntu.com是一个可行的 NTP 站点吗？还是我应该使用另一个 NTP 站点？