How to solve
For emergency maintenance and password recovery, single user mode is used on Linux systems. In such an event, the system can run a limited set of commands, and has limited access to system resources. However, this is enough to reset a root password, or try mounting a previously failed file system mount.
While single user mode is great for system engineers to performance emergency maintenance activities, it can also be abused by evildoers with access to the system. For that reason single user mode should be as limited as possible. The more sensitive data, the higher the restricted access to this feature.
Single user mode on Linux is protected in different ways. It depends on which service manager. For distributions using systemd, have a look at the related targets like rescue, console-shell, and emergency.
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