First things first – remember, always back up important system files before editing!
If you want to view the tradional kernel message output when booting into Ubuntu, you can do it as follows:
Edit /etc/default/grub and edit the following line:
Change it to:
GRUB_CMDLINE_LINUX_DEFAULT="--verbose nosplash debug"
Then, run the following command
It will likely take a few seconds. Then reboot and you should see the kernel messages written to the screen as with older derivatives of Linux.