1. open up grub config file and remove

vim /etc/default/grub;

2. on this line remove the word „quiet“

GRUB_CMDLINE_LINUX_DEFAULT=“resume=/dev/sda1 showopts splash quiet“

3. re generate grub config files

3.1. on redhat/centos/suse12

grub2-mkconfig -o /boot/grub2/grub.cfg

3.1. on debian/ubuntu

update-grub
update-grub2

#which runs:

grub-mkconfig -o /boot/grub/grub.cfg

4. reboot and you should see a more verbose kernel

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