Dual boot Ubuntu and Arch Linux

MultiSystem – Create a MultiBoot USB from Linux

How to Install Multiple Linux Distributions on One USB using MultiBootUSB (Linux/Windows)
- To test Boot ISO function, Ubuntu needs to run 'sudo apt-get install qemu'. See Virtualbox -> QEMU.
- When select USB disk, it must be a partition (eg /dev/sdb1) instead of a drive (eg /dev/sdb). By default, MultiBootUSB will only show the drive but the drop-down list will show the partition if it has been created before.
- I have installed ubuntu, linuxmint, manjaro-xfce, CentOS, tails.
https://sourceforge.net/projects/multisystem/
https://www.pendrivelinux.com/multiboot-create-a-multiboot-usb-from-linux/
http://www.makeuseof.com/tag/combine-multiple-iso-images-burn-single-bootable-iso-image-file/