How to resolve the “No init found” error in Linux systems?

How to resolve the “No init found” error in Linux systems? - : "In Linux systems, all the system processes are carried out by the “init” (short for initialization) program. It runs as a daemon in the system and, usually, has process ID (PID) 1. During the boot process, ‘init’ is the last process to be executed. Sometimes, the system is unable to boot properly, as it cannot find ‘init’."