Debugging grub

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Table of Contents
  1. echo
  2. configuration file
  3. Logs

Here are some tips for debugging strategies for grub.

During the boot process, you can press the Pause|Break key on your keyboard, and press Return to resume.

echo

See in the manual: 14.3.13 echo.

Use echo statements:

echo    'Loading initial ramdisk...'

or:

if [ -e /boot/grub/example/test1.cfg ]; then
    echo "Here"
else
    echo "There"
fi

configuration file

See also in the official manual the section: "5.4 Embedding a configuration file into GRUB".

Logs

Review the kernel logs with dmesg .
Review the appropriate log in /var/log/.