You can disable the splash screen and instead view details about your boot process by following the next steps:
1. Edit grub
sudo vi /etc/default/grub
2. Locate the following line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
and remove quiet and splash.
After that, the line should look like this:
GRUB_CMDLINE_LINUX_DEFAULT=""
3. Save and exit.
:wq
4. Now update the grub:
sudo update-grub
That’s it!