I found boot/grub
How do I login as root so I can change the image?
1. on terminal, type su - <enter>, then enter password.
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wayne@inspiron580s-desktop ~ $ su -
Password:
you should see that the $ prompt is now change to # prompt as shown
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inspiron580s-desktop ~ #
2. you need to use two commands ,
one is to copy , cp file1 file2
another is to move, use to rename a file, mv file1 file2
Here is a demo on how do the change, slightly more steps since I add checking on each step for you to ensure you can follow, actually the step 7 is all you need !! but better to keep backup files:
3. back up : copy the existing two .png files and rename it with .old
To copy, first you are already at root, now you change to the directory /boot/grub
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inspiron580s-desktop ~ # cd /boot/grub
inspiron580s-desktop grub #
4. check that you have two png files by list command
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inspiron580s-desktop grub # ls | grep .png
linuxmint.png
moreblue-orbit-grub.png
5. now do the proper copy plus rename so as these become .old and become your backup
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inspiron580s-desktop grub # cp linuxmint.png linuxmint.png.old
inspiron580s-desktop grub # cp moreblue-orbit-grub.png moreblue-orbit-grub.png.old
6. verify you have them by listing
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inspiron580s-desktop grub # ls | grep .png
linuxmint.png
linuxmint.png.old
moreblue-orbit-grub.png
moreblue-orbit-grub.png.old
inspiron580s-desktop grub #
7. now, rename the moreblue to linuxmint
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inspiron580s-desktop grub # mv moreblue-orbit-grub.png linuxmint.png
8. verify by listing. note that the moreblue-orbit-grub.png file should disappear
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inspiron580s-desktop grub # ls | grep .png
linuxmint.png
linuxmint.png.old
moreblue-orbit-grub.png.old
inspiron580s-desktop grub #
9, now close terminal, reboot, to see the effect of splash changed from grey to Debian blue.