No splash not working

[joneall]

As usual,in 14.10, I have set

GRUB_CMDLINE_LINUX_DEFAULT=""

in /etc/default/grub and run update-grub. So now the boot screen looks different, but it still displays a form of "Kubuntu" logo instead of the boot info. I suppose this is because of something called plymouth. I do not understand how it works (in spite of https://wiki.ubuntu.com/Plymouth nor do I get why it has been added.

How do I get back the boot info?

Also, my system in on /dev/sdb1, but update-grub is not writing to /dev/sda. Do I need to run grub-install? Is it safe to do so?

Thanks in advance.

[NickStone]

First thing to do is

sudo nano /etc/default/grub

Then comment the line in red

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
[color=red]#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"[/color]
GRUB_CMDLINE_LINUX=""

Then update grub

sudo update-grub

Next time you boot up no more plymouth