Due to an abnormal shutdown, after starting Kali, an error message will be displayed:
BusyBox u1.37.0 (Debian 1:1.37.0-4) built-in shell (ash)Enter help’for a list of built-in commands (initramfs)
as shown in the figure below:

About
BusyBox
is a software that integrates more than three hundred of the most commonly used Linux commands and tools. BusyBox includes some simple tools such as ls, cat, and echo, as well as some larger and more complex tools like grep, find, mount, and telnet. Some people refer to BusyBox as the Swiss Army knife of Linux tools. In simple terms, BusyBox is like a big toolbox that integrates and compresses many tools and commands of Linux.
Solution
After successfully executing the command
fsck -y /dev/sda1
, the message file system was modified will appear.

After completing this, enter
exit
to exit.

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