我刚刚从 15.04 升级到 15.10，在启动过程中，我现在收到一条错误消息，指出某些模块无法加载。所以我跑了systemctl status -l systemd-modules-load.service，我得到了这个：
Oct 24 12:22:23 ubuntu systemd-modules-load[292]: Inserted module 'option'
Oct 24 12:22:23 ubuntu systemd-modules-load[292]: could not find module by name='off'
Oct 24 12:22:23 ubuntu systemd-modules-load[292]: Failed to insert 'off': Function not implemented
Oct 24 12:22:23 ubuntu systemd-modules-load[292]: could not find module by name='off'
Oct 24 12:22:23 ubuntu systemd-modules-load[292]: Failed to insert 'off': Function not implemented
Oct 24 12:22:23 ubuntu systemd-modules-load[292]: Inserted module 'cuse'
Oct 24 12:22:23 ubuntu systemd[1]: systemd-modules-load.service: Main process exited, …