我使用 Ubuntu 已经十二年了。去年夏天，我在我的所有系统上全新安装了 20.04 LTS。至少在我的一个系统（我的笔记本电脑）上，它每天都会在 UTC 时间 16:45（当地时间 09:45）播放三拍、两个音符的钟声。它已经这样响了大约 3-4 个月。我没有故意做任何事来造成这种奇怪的行为。没有弹出窗口，也没有与钟声相关的新通知，只有声音。我不知道如何开始排除故障。我应该从哪里开始弄清楚什么是钟声？
更新：今天，钟声在 UTC 时间 15:55（当地时间 08:55）响起，并在“正常”时间 UTC 时间 16:45 再次响起。
这是我使用的命令：
sudo journalctl --since "2022-09-29 08:50:00" --until "2022-09-29 09:54:00"
这是该命令的输出：
-- Logs begin at Thu 2021-10-28 06:14:58 MST, end at Thu 2022-09-29 10:07:19 MST. --
Sep 29 08:55:32 john-Q501LA gnome-shell[2156]: Fontconfig error: Cannot load default config file: No such file: (null)
Sep 29 09:01:35 john-Q501LA gnome-shell[2156]: Error in cpuinfo: failed to parse processor information from /proc/cpuinfo
Sep 29 09:10:05 john-Q501LA gnome-shell[2156]: Fontconfig error: Cannot load default config file: No such file: (null)
Sep 29 09:10:07 john-Q501LA gnome-shell[2156]: Error in cpuinfo: failed to parse processor information from /proc/cpuinfo
Sep 29 09:17:01 john-Q501LA CRON[18953]: pam_unix(cron:session): session opened for user root by (uid=0)
Sep 29 09:17:01 john-Q501LA CRON[18954]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Sep 29 09:17:01 john-Q501LA CRON[18953]: pam_unix(cron:session): session closed for user root
Sep 29 09:24:04 john-Q501LA systemd[1445]: Started Application launched by gnome-shell.
Sep 29 09:25:47 john-Q501LA gnome-shell[2156]: Error in cpuinfo: failed to parse processor information from /proc/cpuinfo
Sep 29 09:30:01 john-Q501LA CRON[19298]: pam_unix(cron:session): session opened for user root by (uid=0)
Sep 29 09:30:01 john-Q501LA CRON[19299]: (root) CMD ([ -x /etc/init.d/anacron ] && if [ ! -d /run/systemd/system ]; then /usr/sbin/invoke-rc.d anacron start >/dev/null; fi)
Sep 29 09:30:01 john-Q501LA CRON[19298]: pam_unix(cron:session): session closed for user root
Sep 29 09:30:38 john-Q501LA systemd[1]: Started Run anacron jobs.
Sep 29 09:30:38 john-Q501LA anacron[19317]: Anacron 2.3 started on 2022-09-29
Sep 29 09:30:38 john-Q501LA anacron[19317]: Normal exit (0 jobs run)
Sep 29 09:30:38 john-Q501LA systemd[1]: anacron.service: Succeeded.
Sep 29 09:38:27 john-Q501LA gnome-shell[2156]: Fontconfig error: Cannot load default config file: No such file: (null)
Sep 29 09:38:41 john-Q501LA gnome-shell[2156]: Fontconfig error: Cannot load default config file: No such file: (null)
Sep 29 09:39:58 john-Q501LA gnome-shell[2156]: Error in cpuinfo: failed to parse processor information from /proc/cpuinfo
Sep 29 09:39:59 john-Q501LA gnome-shell[2156]: [2443:2443:0929/093959.370379:ERROR:gl_utils.cc(319)] [.WebGL-0x347c0033ff00]GL Driver Message (OpenGL, Performance, GL_CLOSE_PATH_NV, High): GPU stall due>
Sep 29 09:40:46 john-Q501LA kernel: perf: interrupt took too long (3963 > 3937), lowering kernel.perf_event_max_sample_rate to 50250
Sep 29 09:48:49 john-Q501LA gnome-shell[2156]: Error in cpuinfo: failed to parse processor information from /proc/cpuinfo`enter code here`