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How to do this manually, not installing any tools?

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How do you want to change it? Add a background image, change to another color, ...? –  JanC Jun 7 '11 at 16:50
2  
@Rulet if you know the answer please put it in as an answer and approve it. Editing the question is not the correct method. –  Rinzwind Jul 3 '11 at 18:29

5 Answers 5

This is an excerpt from The Community Documentation on Grub2

Turning off the splash image: This may make viewing the terminal easier.

1.Press "c" to go to the command line and then type: set color_normal=white/blue or the color combination you wish to use.

2."black" as the second entry retains the menu's transparency and should be avoided as a selection if the user wants to work with a solid background color.

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The purple background isn't an image though. –  JanC Jun 7 '11 at 16:49
    
Yes, it's a color combination that you can set with set color_normal=xxx/xxx –  nitstorm Jun 7 '11 at 16:51
    
I think that only sets the colour (or transparency) for the menu, not for all of grub; and in any case there are lots of other possibilities, including creating your own theme. –  JanC Jun 7 '11 at 22:31

It's very simple:

gksu gedit /lib/plymouth/themes/text.plymouth 

and change black value with your color, in my case #000000 is black

black=0x000000

Regards

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Ok. I've decided to write the answer. I took instructions from here

In my case screen resolution is 1440X900. Somebody says that changing grub window resolution to actual resolution of monitor makes boot faster(but I don't see this take effect in last versions o Ubuntu). So I've changed and uncommented one line in /etc/default/grub to this:

GRUB_GFXMODE=1440x900

Then to change purple background of grub I created the image, in my case just black image with 1440X900 resolution and put it in /boot/grub. So my file is:

/boot/grub/gbackground.jpg

Then I've edited again /etc/default/grub and puted a line in it:

GRUB_BACKGROUND=/boot/grub/gbackground.jpg

then I updated grub configuration with command:

sudo update-grub

That's all. Now grub background is black.

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This is my way:

  • Before 13.10:

    sudo -H gedit /lib/plymouth/themes/default.grub
    
  • 13.10 and later:

    sudo -H gedit /lib/plymouth/themes/ubuntu-logo/ubuntu-logo.grub
    

And change the grub background color as you want, in my case I change grub background to black (0,0,0)

if background_color 0,0,0 ; then
   clear
fi

Then, update grub

sudo update-grub

Please note that: there should be a space after the color value, other wise you will always get a black background. And as a gift, try using this value 35,00,60.

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default.grub is not found in /lib/plymouth/themes/default.grub –  Roshan George May 30 '12 at 4:47
    
>>>>This answer is icorrect<<<<< –  Zignd Oct 7 '12 at 13:24
    
In case anyone couldn't tell, these are RGB values for the color. –  minerz029 Oct 2 '13 at 22:59

I would first get your image, then bring up Terminal type

sudo nautilus

copy or cut image into /boot/grub.

Open the terminal and type

sudo update-grub

There you go.

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What? Just dropping an image in /boot/grub will make it appear at grub menu? I don't think so. –  Eric Carvalho Feb 2 '13 at 18:44
    
@EricCarvalho It actually does. In /etc/grub.d/05_debian_theme, lines 163-168 there is code to search for and use an image in /boot/grub. –  minerz029 Feb 5 at 20:21

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