Ubuntu 20.04 Shows Your OEM's Logo on the Boot Screen - OMG! Ubuntu
grub-pc [Wiki ubuntu-fr]
Custom Boot Splash | How to change boot splash screen on Ubu… | Flickr
Replace Manufacturer Logo in Ubuntu 22.04 | 22.10 Startup Screen – UbuntuHandbook
How to Boot Single User Mode in Ubuntu | ITGala.xyz
Setup Bootsplash on Ubuntu/Debian – grub silent or verbose boot mode -
windows 7 - Change default option on dual boot screen - Super User
GitHub - michalpajtinka/Ubuntu-boot-splash-colour-change: How to change purple Plymouth boot screen to any colour you like (you can also change boot screen logo).