menuentry "Regolith 1.6.0_focal ISO" --class Ubuntu {
set iso_file="/opt/iso/regolith/latest/Regolith_1.6.0_focal"
search --set=iso_partition --no-floppy --file $iso_file
probe --set=iso_partition_uuid --fs-uuid $iso_partition
set img_dev="/dev/disk/by-uuid/$iso_partition_uuid"
loopback loop ($iso_partition)$iso_file
set boot_option=""
#set boot_option="locale=zh_TW"
#set boot_option="quiet splash"
linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$iso_file $boot_option
initrd (loop)/casper/initrd
}