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I've been reading a tutorial that shows how to set the background image that will be displayed behind the GRUB2 boot options menu. However, I am concerned that the text might not be visible against the image I've chosen. How can I preview what the screen will look like, without having to restart the computer?

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The easiest way is to use grub-emu. On Debian based systems, this can be installed with

sudo apt-get install grub-emu 

Once you have installed it, you can run it to preview your grub setup:

sudo grub-emu
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    To get out of the emulator use c (command line) and then type 'reboot' – user462982 Mar 19 '14 at 15:49
  • Note that you have to type in the original terminal, not the emulation window. – pchaigno May 8 '18 at 10:24

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