grub multiboot com tudo funcionando

grub.cfg

#Multiboot USB - https://gist.github.com/morkin1792
#1.
#Instalar grub:
# grub-install --target=i386-pc --root-directory=/local/usb/montado /dev/sdX --force #instala grub no modo pc/bios
# grub-install --target=x86_64-efi --root-directory=/local/usb/montado /dev/sdX --removable #instala grub no modo uefi

#2.
#para instalar no modo uefi a particao do grub deve ser fat32 (esp partition), já no modo pc pode-se usar outros sistemas de arquivos
#as isos podem ficar em qualquer particao com 'qualquer' sistemas de arquivos, apenas deve-se setar o uuid dessa mais abaixo
#pode-se instalar em ambos os modos, pc/bios e uefi, se nao for feito apenas pcs com suporte para o modo escolhido bootarao o pendrive

#3.
#Por fim, coloca-se este grub.cfg configurado (trocando uuid e menus entries) em /boot/grub/ (caso utilize-se uma particao para o grub-pc e outra para o grub-efi deve-se colocar o grub.cfg em ambas)

#Fontes:
#Instalacao e menu entries - https://wiki.archlinux.org/index.php/Multiboot_USB_drive
#Fedora e Debian based menu entry - https://github.com/thias/glim/tree/master/grub2



insmod part_gpt
insmod part_msdos
insmod gzio
insmod ext2
insmod chain
insmod search_fs_uuid
insmod all_video
insmod gfxterm
insmod gettext
insmod png
insmod jpeg


set default=1
set timeout=15

if [ "${grub_platform}" == "efi" ]; then
    insmod efi_gop
    insmod efi_uga
    insmod video_bochs
    insmod video_cirrus
    set gfxpayload=keep
fi
#set gfxmode=auto

#Set Fontes
loadfont /boot/grub/fonts/unicode.pf2
set locale_dir=/boot/grub/locale
set lang=pt_BR

#Load theme
set theme=${prefix}/themes/starfield/theme.txt
export theme   #para continuar em outros submenus

terminal_output gfxterm    #carrega terminal grafico, necessario para mudar background

##Changing root partition
#set root=(hd0,2) || set root=(hd1,2)
set uuid="6ebf7a3b-394c-4d47-ad1e-2fc76b383d8c" #uuid partition iso's
export uuid
search --no-floppy --fs-uuid --set=root $uuid   #troca particao root

set color_normal=light-green/black
set menu_color_normal=white/black
set menu_color_highlight=light-blue/white
background_image "/.default.png"


if [ "${grub_platform}" == "efi" ]; then   #apenas para indicar o modo
    menuentry 'Booting in UEFI Mode' {
        fwsetup
    }
elif [ "${grub_platform}" == "pc"  ]; then
    menuentry 'Booting in PC/Legacy Mode' {
        reboot
    }
fi

submenu 'Arch Based ->' {
    menuentry 'Arch Linux 01/10/16 amd64' {
        set imgdevpath="/dev/disk/by-uuid/$uuid"
        set isofile="/distros/archlinux-2016.10.01-dual.iso"
        echo 'Carregando Imagem ISO do sistema...'
        loopback loop $isofile
        echo   'Loading Kernel Image...'
        linux (loop)/arch/boot/x86_64/vmlinuz root=UUID=$uuid archisodevice=/dev/loop0 img_dev=$imgdevpath img_loop=$isofile earlymodules=loop
        echo   'Loading Initrd Image...'
        initrd (loop)/arch/boot/x86_64/archiso.img

    }

    menuentry 'Manjaro Xfce 16.10.3 amd64' {
        set uuid="1F0E-DB30" #a iso do manjaro esta em outra particao
        search --no-floppy --fs-uuid --set=root $uuid #setando o root como a outra partição
        set imgdevpath="/dev/disk/by-uuid/$uuid"
        set isofile="/distros/manjaro-xfce-16.10.3-stable-x86_64.iso"
        echo 'Carregando Imagem ISO do sistema...'
        loopback loop $isofile
        echo   'Loading Kernel Image...'
        set options="misobasedir=manjaro misolabel=MJRO1610 nouveau.modeset=1 i915.modeset=1 radeon.modeset=1 logo.nologo overlay=free"
        linux (loop)/manjaro/boot/x86_64/manjaro root=UUID=$uuid archisodevice=/dev/loop0 img_dev=$imgdevpath img_loop=$isofile earlymodules=loop $options quiet splash
        echo   'Loading Initrd Image...'
        initrd (loop)/manjaro/boot/intel_ucode.img
        initrd (loop)/manjaro/boot/x86_64/manjaro.img

    }
    menuentry 'Manjaro KDE 16.10.3 amd64' {
        set imgdevpath="/dev/disk/by-uuid/$uuid"
        set isofile="/distros/manjaro-kde-16.10.3-stable-x86_64.iso"
        echo 'Carregando Imagem ISO do sistema...'
        loopback loop $isofile
        echo   'Loading Kernel Image...'
        set options="misobasedir=manjaro misolabel=MJRO1610 nouveau.modeset=1 i915.modeset=1 radeon.modeset=1 logo.nologo overlay=free"
        linux (loop)/manjaro/boot/x86_64/manjaro root=UUID=$uuid archisodevice=/dev/loop0 img_dev=$imgdevpath img_loop=$isofile earlymodules=loop $options quiet splash
        echo   'Loading Initrd Image...'
        initrd (loop)/manjaro/boot/intel_ucode.img
        initrd (loop)/manjaro/boot/x86_64/manjaro.img
        
    }
}

submenu 'Ubuntu Based ->' {
    menuentry 'Ubuntu 16.04.1 amd64' {
        set uuid="1F0E-DB30" #iso em outra particao
        search --no-floppy --fs-uuid --set=root $uuid #
        set iso="/distros/ubuntu-16.04.1-desktop-amd64.iso"
        echo 'Carregando Imagem ISO do sistema...'
        loopback loop $iso
        set bootoptions="boot=casper locale=pt_BR bootkbd=qwerty/br-abnt2 console-setup/layoutcode=br iso-scan/filename=$iso quiet splash"
        echo   'Loading Kernel Image...'
        linux (loop)/casper/vmlinuz.efi $bootoptions
        echo   'Loading Initrd Image...'
        initrd (loop)/casper/initrd.lz
    }

    menuentry 'Elementary OS 0.4 21/09/16 amd64' {
        set iso="/distros/elementaryos-0.4-stable-amd64.20160921.iso"
        echo 'Carregando Imagem ISO do sistema...'
        loopback loop $iso
        set bootoptions="boot=casper locale=pt_BR bootkbd=qwerty/br-abnt2 console-setup/layoutcode=br iso-scan/filename=$iso quiet splash"
        echo   'Loading Kernel Image...'
        linux (loop)/casper/vmlinuz $bootoptions
        echo   'Loading Initrd Image...'
        initrd (loop)/casper/initrd.lz
    }
}


submenu 'Redes e Seguranca ->'{
    menuentry 'Kali 2016.2 Xfce amd64'{
        set iso="/distros/kali-linux-xfce-2016.2-amd64.iso"
        loopback loop $iso
        linux (loop)/live/vmlinuz boot=live findiso=$iso noconfig=sudo username=root hostname=kali
        initrd (loop)/live/initrd.img
    }

    menuentry 'Tails i386' {
        set iso="/distros/tails-i386-2.6.iso"
        echo 'Carregando Imagem ISO do sistema...'
        loopback loop $iso
        set bootoptions="boot=live findiso=$iso components quiet splash"
        echo   'Loading Kernel Image...'
        linux (loop)/live/vmlinuz $bootoptions
        echo   'Loading Initrd Image...'
        initrd (loop)/live/initrd.img
    }
}

menuentry 'Deepin 15.3 amd64' {
    set iso="/distros/deepin-15.3-amd64.iso"
    echo 'Carregando Imagem ISO do sistema...'
    loopback loop $iso
    set bootoptions="boot=live findiso=$iso components quiet splash"
    echo   'Loading Kernel Image...'
    linux (loop)/live/vmlinuz $bootoptions
    echo   'Loading Initrd Image...'
    initrd (loop)/live/initrd.lz
}

menuentry "Fedora 25 Mate Compiz x86_64" --class fedora {
    set iso="/distros/Fedora-MATE_Compiz-Live-x86_64-25-1.3.iso"
    search --set -f $iso
    echo "Using ${iso}..."
    loopback loop $iso
    linux (loop)/isolinux/vmlinuz root=live:CDLABEL=Fedora-MATE-Live-25-1-3 rd.live.image iso-scan/filename=${iso} locale=pt_BR bootkbd=qwerty/br-abnt2 console-setup/layoutcode=br quiet splash
    initrd (loop)/isolinux/initrd.img
}

menuentry 'openSUSE Live' {
    set imgdevpath="/dev/disk/by-uuid/$uuid"
    set iso="/distros/openSUSE_Krypton.x86_64-5.8.90-Build1.28.iso"
    loopback loop $iso
    linux (loop)/boot/x86_64/loader/linux isofrom_device=$imgdevpath isofrom_system=$iso LANG=pt_BR.UTF-8 console-setup/layoutcode=br quiet splash
    echo Loading initrd...
    initrd (loop)/boot/x86_64/loader/initrd

}

TIP: Se for instalar o modo efi em um pc, montar o esp em /boot/efi (soh o efi-directory nao resolve)