需要修复什么才能让 systemd 执行服务？

Question

这是 systemd 服务模板/usr/local/lib/systemd/system/journal-split.service：

[Unit]
Description=Journal Splitter Service / System Init Messages
Documentation=man:journalctl(1) man:systemd-journal-remote(8)
#RefuseManualStart=true

[Service]
Type=oneshot
RemainAfterExit=yes
User=root
Group=systemd-journal
ExecStart=/usr/local/lib/systemd/journal-split.sh
StandardOutput=journal
StandardError=journal

[Install]
WantedBy=multi-user.target default.target

服务安装：

$ systemd-analyze verify journal-split.service
$ sudo systemctl daemon-reload
$ sudo systemctl enable journal-split.service
Created symlink /etc/systemd/system/multi-user.target.wants/journal-split.service → /usr/local/lib/systemd/system/journal-split.service.
Created symlink /etc/systemd/system/default.target.wants/journal-split.service → /usr/local/lib/systemd/system/journal-split.service.
$ sudo reboot

重启后，服务被加载但不执行：

$ systemctl status journal-split
○ journal-split.service - Journal Splitter Service / System Init Messages
     Loaded: loaded (/usr/local/lib/systemd/system/journal-split.service; enabled; vendor preset: disabled)
     Active: inactive (dead)

什么可能会阻止执行？

我可以使用手动执行该服务sudo systemctl start journal-split并且它运行成功。