usb启动盘安装grub

EFI启动方式

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# u盘是sdb的情况下
mkdir /mnt/1
mkdir /mnt/2
mkdir /mnt/3

local dev="sdb"
umount ${dev}*
parted -s ${dev} mklabel gpt  # GPT
parted -s ${dev} mkpart ESP fat32 1MiB 301MiB set 1 esp on
parted -s ${dev} mkpart boot ext4 301MiB 701MiB
parted -s ${dev} mkpart primary ext4 701MiB 100%

mkfs.vfat -F 32 ${dev}1
mkfs.ext4 -F ${dev}2
mkfs.ext4 -F ${dev}3

local boot_dir=/mnt/1
local grub_boot=/mnt/2
local target=x86_64-efi  # x86_64-efi x86架构；arm64-efi arm架构
grub-install --efi-directory=${boot_dir} --boot-directory=${grub_boot}  --target=${target}  ${dev} --removable  --bootloader-id=ubuntu