If you notice that you don't have any tty's and no boot prompt (when
the Ubuntu splashscreen is not enabled), then this might fix your
Edit /etc/initramfs-tools/modules and add the lines (modules)
Uncomment vesafb in /etc/modprobe.d/blacklist-framebuffer, so
the line should look like
# blacklist vesafb
sudo update-initramfs -u
The -u option is used to update your existing initrd image. Please
make sure that you first edit the initramfs modules and the blacklist
before you update the initramfs.
Reboot. It should work now.