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How to set up GRUB to boot Linux SD card?
Set up GRUB to boot a Linux SD card (on a Linux computer) GRUB is the bootloader used by most Linux systems. If your computer has Ubuntu installed it is using grub to boot, though if you don’t have a “dual-boot” system you may not see it.
Why is Linux Grub preventing me from booting from USB?
If unetbootin changed the layout of the boot files without also adjusting the configuration of the UEFI bootloader (which might be found at \\EFI\\boot\\bootx64.cfg or \\EFI\\boot\\grub.cfg ), then your boot attempt from the USB media might end up with an UEFI GRUB with no valid configuration.
How to install Grub on a USB stick?
Alternatively, once you get the system booted using the SD as the root filesystem, you could just copy the kernel and initramfs files from the current /boot directory to the root directory of the USB stick, mount it as /boot, then reinstall GRUB on the USB stick using grub-install.
Can a Linux SD card be booted from Windows?
If your computer is set up to dual-boot with Windows and another OS, you may follow either these instructions or Booting a Linux SD card from Windows. Recently a new version of Grub, Grub 2, was introduced, which uses different control files than Grub 1, which is commonly called Legacy Grub.
How to chainload GRUB files to a SD card?
What the problem is that which mbr will be read first, h/d or flash/usb. You can install all of grub files in one partition then chainload that partition and it will not care which grub boots it if that is what you are referring to. If using grub2 you will probably have to use the -force option.
When to use GRUB2 or GRUB Legacy on SD card?
SD card shows as sdc when plugged into a USB SD reader and /media/mmc (long string of numbers) when in the internal slot. I have downgraded grub2 to grub legacy since there is more documentation and it is easier to understand.