What is the difference between these two options in
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" GRUB_CMDLINE_LINUX=""
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From the wiki on Grub Setup
GRUB_CMDLINE_LINUX Entries on this line are added to the end of the 'linux' command line (GRUB legacy's "kernel" line) for both normal and recovery modes. It is used to pass options to the kernel.
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" This line imports any entries to the end of the 'linux' line (GRUB legacy's "kernel" line). The entries are appended to the end of the normal mode only. To view a black screen with boot processes displayed in text, remove "quiet splash". To see the grub splash image plus a condensed text output, use "splash".
They're pretty horrendously named for having to do predominately with the modes in which they apply and not having anything to do with