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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.
See in the manual: 14.3.13 echo.
echo 'Loading initial ramdisk...'
if [ -e /boot/grub/example/test1.cfg ]; then
See also in the official manual the section: "5.4 Embedding a configuration file into GRUB".
Review the kernel logs with dmesg .
Review the appropriate log in /var/log/.