<https://askubuntu.com/posts/1434549/timeline>
Hello. I'm trying to extract all the files from a (bootable) Debian ISO and then re-generate a bootable ISO image. Below you can see the commands that I've issued. For some unknown reason,the generated ISO image does not boot. Can someone help me to understand why ? thanks. apt update && apt -y install xorriso genisoimage wget https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-11.5.0-amd64-netinst.iso xorriso -osirrox on -indev debian-11.5.0-amd64-netinst.iso -extract / isofiles/ genisoimage -r -J -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -o debian-11-unattended.iso isofiles As you can see I haven't done any modification to the files inside the ISO image,so the error should be most likely on the latest command. According with this post : https://unix.stackexchange.com/questions/572751/how-to-make-a-reproducible-iso-file-with-mkisofs-genisoimage I have also tried with this command : mkisofs -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -J -R -v -T -V 'd-live 11.5.0 xf amd64' "isofiles/" > file.iso but also in this case the ISO produced is not bootable : https://ibb.co/GstvTvR I've omitted the parameter "*-reproducible-date=20221009*" because it hasn't been accepted. The error produced is : *"genisoimage: Uh oh, I can't find the boot image 'producible-date=20221009'* and the ISO produced is only 32k. This is how is the internal structure of the debian ISO file produced by the command above : # isoinfo -d -i debian-11-unattended.iso CD-ROM is in ISO 9660 format System id: LINUX Volume id: d-live 11.5.0 xf amd64 Volume set id: Publisher id: Data preparer id: Application id: GENISOIMAGE ISO 9660/HFS FILESYSTEM CREATOR (C) 1993 E.YOUNGDALE (C) 1997-2006 J.PEARSON/J.SCHILLING (C) 2006-2007 CDRKIT TEAM Copyright File id: Abstract File id: Bibliographic File id: Volume set size is: 1 Volume set sequence number is: 1 Logical block size is: 2048 Volume size is: 224756 El Torito VD version 1 found, boot catalog is in sector 1020 Joliet with UCS level 3 found Rock Ridge signatures version 1 found Eltorito validation header: Hid 1 Arch 0 (x86) ID '' Key 55 AA Eltorito defaultboot header: Bootid 88 (bootable) Boot media 0 (No Emulation Boot) Load segment 0 Sys type 0 Nsect 4 Bootoff 3FD 1021 You can also give a look at this full log,maybe you find the reason of the failure : pastebin.ubuntu.com/p/XyJKSf2mK8 I guess the error could be : xorriso : NOTE : Detected El-Torito boot information which currently is set to be discarded" but I don't know,really. Im dealing with this error from 1 week,I have asked help in a lot of places,but no one really understood why. I hope you can. -- Mario.
