Discover How To Learn Tips And Tricks HOWTOs
How To Interrupt the Linux Boot Process
Interrupting the boot process is useful for troubleshooting and maintenance, but make sure you enable full disk encryption first.
During a computer's boot process, you must transition from a firmware (UEFI or BIOS) process to loading a kernel and then finally to the user environment. When booting a POSIX system, you can choose to interrupt the boot process to adjust settings or even to log in using a chroot environment.
This is a useful troubleshooting and maintenance technique, but it's also the reason it's so important to utilize full disk encryption when installing your operating system. When a drive is encrypted, nothing on the drive is accessible without your passphrase, even from a preboot environment. As long as you have the passphrase to decrypt your drive, you can interrupt a Linux system's boot process and access the drive without booting into a full operating system (OS).