I used MultiWriter to create an Ubuntu installation USB from the file: ubuntustudio-20.04.4-dvd-amd64.iso
There is a modification I want to do to these files before they are used to do an installation. But I do not have write permissions on the ISO 9660 formatted USB. Is there a way make this USB writable? Is there a way to create a USB installation USB this is writable?
What the modifications I seek to do are described here: https://www.reddit.com/r/pop_os/comments/p1nci7/pop_os_2104_zfs_on_root_install/ This requires a modification to the installation files. I cannot now do this. Can it be done with Cubic, or schroot?