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Extract a ISO from a Distri for example Ubuntu here 16.04
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mksquashfs linux_folder_SYSTEM casper/filesystem.squashfs
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sudo xorriso -as mkisofs -o ~/syslinux.iso -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -iso-level 3 -joliet-long -J -R -V "SYSLINUX_BOOT" ~/ubuntu-iso