@ Michael Hudson-Doyle, @ Olivier Robert, What do you think of the following idea for Ubuntu Focal Fossa?
It is possible to add the boot option - 'persistent' in order to create a persistent live drive or - 'nopersistent' in order to create a live-only drive. I am looking for a method to edit the iso file (binary edit) without loss of any current feature. --- $ echo -n ' nopersistent '| wc -c 14 --- In order to add one of these boot options we need an unused space of 13 blank (alias 'space') characters in the iso file. I suggest that it is made so that the image contains such space in the image of grub.cfg and the corresponding file for syslinux. So for the 'linux lines' in grub.cfg put 14 blanks (not 1 blank as it is now) 'linux ... quiet splash ---' 'linux ... quiet splash persistent ---' 'linux ... quiet splash nopersistent ---' and for the 'append lines' in isolinux/txt.cfg 'append ... quiet splash ---' 'append ... quiet splash persistent ---' 'append ... quiet splash nopersistent ---' This way we can add those boot options without removing anything except blank characters and at the same time without offset of the code after the substitutions. I have tested that this kind of substitution works in a straightforward way with 'sed' from the iso file. I have a method with a shellscript that 'wraps a safety belt' around the process and can write directly to the device without creating a modified file, ubuntu.iso < sed 's/quiet splash ---/quiet splash persistent ---/' > /dev/sdx or ubuntu.iso < sed 's/quiet splash ---/quiet splash nopersistent ---/' > /dev/sdx -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1851123 Title: Ubuntu 19.10 and focal live cloned create and mount casper-rw partition To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1851123/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
