如图所示：
Ubuntu 14.04.2 LTS (14.04) (on /edv/sdb10)
Ubuntu 15.04 (15.04) (on /edv/sdb2)
...
在ask ubuntu 上看到的，一个大神改了grub分辨率加背景图片。
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
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