Once

shift / esc to menu , then 'e' to modify boot option, change "quiet splash" to "text", F10 / Ctrl+x to continue boot.

Always

> sudo su

> vi /etc/default/grub

comment out: # GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

add:                      GRUB_CMDLINE_LINUX="text"

Uncomment : GRUB_TERMINAL=console

> sudo update-grub