kali 改变grub引导背景

１.update-grub

输出：Generating grub configuration file ...
Found background image: /usr/share/images/desktop-base/desktop-grub.png
Found linux image: /boot/vmlinuz-4.9.0-kali3-amd64
Found initrd image: /boot/initrd.img-4.9.0-kali3-amd64
Found Windows 7 on /dev/sda1
done

2.file  /usr/share/images/desktop-base/desktop-grub.png

输出：/usr/share/images/desktop-base/desktop-grub.png: symbolic link to /etc/alternatives/desktop-grub

这是一个连接　target is  ----->   /etc/alternatives/desktop-grub

3. file(or ls -l) /etc/alternatives/desktop-grub

输出：desktop-grub: symbolic link to /usr/share/desktop-base/active-theme/grub/grub-4x3.png

一样这是一个连接，最终指向/usr/share/desktop-base/active-theme/grub/grub-4x3.png

而grub-4x3.png就是咱们须要更改的grub的背景图片

４.先将原文件备份：mv　/usr/share/desktop-base/active-theme/grub/grub-4x3.png　　 /usr/share/desktop-base/active-theme/grub/grub-4x3.png.bkp

5.将下载好的图片放到文件目录下并重命名：cp　/root/下载/xxxx.png　/usr/share/desktop-base/active-theme/grub/grub-4x3.png

6.在图片选取的过程当中的我发现须要.png格式的图片才行，eg:.jpg  .jpeg不行，因此就须要图片转换工具

在这里我用的是imagemagick

用法：convert  xxx.jpg   xxx.png   (在当前目录下)

７.update-grub