Multiple methods exist to recover a broken Linux Operating System. Like any problem, there is a method for every problem and a broken operating system could have multiple causes. To recover a Linux do it with a Senior Administrator by you if you don't know what you are doing.
1) Enter in Single user mode, for this you would need to remember the root password but if you do, you can correct any problem related with networking or some drivers because the initialization scripts are not executed.
In the boot screen put "1" as boot parameter.
Then enter the root password and start analyzing logs, filesystem. Do not forget to check the memory with a live cd and memcheck86
2) Suppose that you forgot the root password or a BOFH has changed it, you can still use this trick to enter without the root password:
Enter "init=/bin/bash rw"
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