Simple ISO Booter using mkusb.
https://askubuntu.com/questions/1075755/create-bootable-ubuntu-usb-on-a-partition-instead-of-overwriting-the-entire-usb/1080749#1080749
When setting up mkusb select "usb-pack-efi" per post #18 above. It should insure the use of grub 2.02.
More Complex ISO Booter using mkusb
If you wish to add up to 8GB of persistence to each ISO using casper-rw and home-rw files with persistent-path see:
https://askubuntu.com/questions/1183191/handmade-live-usb-multisystem/1184111
Simple ISO Booter using mkusb.
https:/ /askubuntu. com/questions/ 1075755/ create- bootable- ubuntu- usb-on- a-partition- instead- of-overwriting- the-entire- usb/1080749# 1080749
When setting up mkusb select "usb-pack-efi" per post #18 above. It should insure the use of grub 2.02.
More Complex ISO Booter using mkusb
If you wish to add up to 8GB of persistence to each ISO using casper-rw and home-rw files with persistent-path see:
https:/ /askubuntu. com/questions/ 1183191/ handmade- live-usb- multisystem/ 1184111