To get Ubuntu booting every time you can disable the splash screen in the kernel parameter or hit ESC while Ubuntu is showing the splash screen. With this booting won't stuck.
To disable splash screen modify as root in /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to
GRUB_CMDLINE_LINUX_DEFAULT=""
Same with a Asus M3N78-EM Motherboard.
To get Ubuntu booting every time you can disable the splash screen in the kernel parameter or hit ESC while Ubuntu is showing the splash screen. With this booting won't stuck.
To disable splash screen modify as root in /etc/default/grub
GRUB_CMDLINE_ LINUX_DEFAULT= "quiet splash" LINUX_DEFAULT= ""
to
GRUB_CMDLINE_
Save it and run as root: update-grub