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/etc/default/grub does just not seem to exist on my system. I have a Raspberry Pi 3b+ running ubuiqityrobot which is an Ubuntu version with OS pre-installed.
I want to find this GRUB file to edit one line of code to stop the loading dots from boot to remain in the center of my screen.
My question is. Where is my /etc/default/grub file?
Your observation is correct. Raspberry Pi does not use GRUB at all.
GRUB is not universal in the Linux world, but a bootloader for some specific hardware architectures:
Raspberry Pi is an ARM device, which is none of the above. It has its own firmware and bootloader.
The first stage bootloader is stored in ROM within the RasPi's system-on-chip.
It loads bootcode.bin from the SD card. That will load start.elf, which will then load config.txt, cmdline.txt and kernel.img. In older versions of RasPi firmware, there used to be loader.bin step in between bootcode.bin and start.elf.
More details:
https://raspberrypi.stackexchange.com/q/10489
https://www.raspberrypi.org/forums/viewtopic.php?t=6685
config.txt settings: http://rpf.io/configtxtreadme
cmdline.txt is the place for the Linux kernel boot options.
GRUB_GFXMODE=1280x800 and GRUB_GFXPAYLOAD_LINUX=keep in /etc/defaults/grub and then rebuilt the Grub with sudo update-grub and sudo reboot.
/boot/config.txt, there should be commented-out lines with hdmi_group, hdmi_mode, framebuffer_width and framebuffer_height, ready to be uncommented and adjusted as needed. See rpf.io/configtxtreadme for more info. Once the Linux kernel is up and running, there is also the fbset command which can be used to change the display mode as needed.