Utilizando o Grub2

Link: http://ubuntuforums.org/showthread.php?t=1195275

Para mostrar menu desabilitado aperte SHIFT.

Para forçar o menu mesmo em um sistema com apenas 1 sistema operacional instalado altere o arquivo:
/etc/default/grub

Para (comente a linha GRUB_HIDDEN_TIMEOUT):
#GRUB_HIDDEN_TIMEOUT=5
GRUB_HIDDEN_TIMEOUT_QUIET=false
GRUB_TIMEOUT=5

Depois execute o comando:
sudo update-grub

link: http://ubuntuguide.net/let-grub2-remember-and-auto-select-last-entry-you-booted
Para utilizar a ultima opção executada como default.
altere:
GRUB_DEFAULT=0
para:
GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true

link: http://linuxforums.org.uk/index.php?topic=10701.0
Para forçar que apareça o menu do grub durante o boot, comente a linha:
# GRUB_HIDDEN_TI MEOUT=0
Para forçar que o menu deixe de fazer a contagem regressiva:
GRUB_TIMEOUT=-1

Para alterar a imagem que é mostrada durante o grub2 altere o arquivo:
/etc/grub.d/05_debian_theme

nas linhas:
  WALLPAPER="/usr/share/images/desktop-base/moreblue-orbit-grub.png"
  COLOR_NORMAL="black/black"
  COLOR_HIGHLIGHT="magenta/black"

Por exemplo para:
WALLPAPER="/usr/share/images/grub/Lake_mapourika_NZ.tga"

Depois de instalar lgumas imagens disponiveis na comunidade:
sudo apt-get install grub2-splashimages

Veja abaixo como alterar a resolução do menu do grub2:
Changing Menu Resolutions
If the user wishes to change the resolution of the GRUB 2 screen while using a splash image follow these steps:
  1. Set the desired resolution in /etc/default/grub
    • Change the value of GRUB_GFXMODE= (Example: GRUB_GFXMODE=800x600)
      • If unsure of what resolutions are available to GRUB 2 they can be displayed by typing vbeinfo in the GRUB 2 command line. The command line is accessed by typing "c" when the main GRUB 2 menu screen is displayed.
  2. Select an image of the same size and make the change in /etc/grub.d/05_debian_theme
    • The image name is located in the line beginning with " for i in {/boot"
    • If an image of the correct size is not used, the menu will not be positioned correctly.
    • Use the image editor of your choice to create/resize an image to the correct size.
    • The user may be able to view the image size via Properties in a file browser (check the Properties Image tab in Nautilus).
  3. Run update-grub as root to add the new settings to /boot/grub/grub.cfg
Outro link: https://help.ubuntu.com/community/Grub2#/etc/default/grub%20(file)

Instale tb o jogo grub invaders:
sudo apt-get install grub-invaders

Veja este link para muito mais detalhes ainda:
http://members.iinet.net/~herman546/p20/GRUB2%20Splashimages.html


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