We are entering into emergency mode because of, In emergency mode, you are booted into the most minimal environment possible. The root file system is be mounted read-only and almost nothing is set up. The main advantage of emergency mode over single-user mode is that the init files are not loaded. If init is corrupted or not working, you can still mount file systems to recover data that could be lost during a re-installation.
Whenever the init script is not running then while seeing the below window,
edit the second line and at the ending enter as an emergency then press b.
Giving option "emergency" by editing the kernel line in the begining of the system boot.
It'll ask for the password of root user by executing the script "sulogin". It wont run any of other init scripts.
Inittab file passes the control to rc.sysinit script.
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