因此，我使用 Anacron 能够每天可靠地运行一些脚本。然而，当 Anacron 本身有一半时间没有在启动时启动时，这不起作用。我怎样才能让 Anacron 可靠地启动？
> grep 'anacron' /var/log/syslog.2
May 18 19:09:02 s-laptop anacron[2480]: Job `cron.daily' terminated (exit status: 1) (mailing output)
May 18 19:09:02 s-laptop anacron[2480]: Can't find sendmail at /usr/sbin/sendmail, not mailing output
May 18 19:09:02 s-laptop anacron[2480]: anacron: Can't find sendmail at /usr/sbin/sendmail, not mailing output
May 18 19:09:02 s-laptop anacron[2480]: Normal exit (1 job run)
May 18 21:20:48 s-laptop systemd[1]: Started Run anacron jobs at resume.
May 20 16:30:46 s-laptop systemd[1]: Started Run anacron …anacron ×1