解决文件被屏蔽的问题(Unit file is masked)

注：这里的“mask”是系统服务的一个状态，相当于被“屏蔽”，运行unmask，然后重新安装

# Failed to preset unit: Unit file /etc/systemd/system/php8.0-fpm.service is masked.
# systemctl unmask php8.0-fpm.service
# systemctl enable php8.0-fpm.service