Hi, > how do I mount it to copy those 5 or so > files out of it and back to this card? I've not used the -oloop option > in a decade and have long since forgot how.
Since -o loop felt neglected it decided to become optional. So, provided you have an existing mount directory (here /mnt/iso) just mount the ISO file (here assumed to be debian-10.0.0-amd64-netinst.iso in the current working directory): sudo mount debian-10.0.0-amd64-netinst.iso /mnt/iso This command will show that you then have a loop device /sbin/losetup -l Have a nice day :) Thomas