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I created a custom Debian Live ISO and burned to pendrive with dd. The pendrive can be booted from BIOS with no problems.
Now I want to be able to boot the same live system from UEFI too (without removing isolinux). This way I can use the same pendrive with any firmware (BIOS and UEFI). I tried with rufus with no success. I think xorriso should do the trick, but many attempts didn't success. I even created an ESP partition on the pendrive and there I copied the content of the /boot/grub directory (and changed grub.cfg accordingly). No way to make it work. Can someone help me? Thanks.
Head_on_a_Stick wrote:But you should probably be using live-build instead of doing this manually.
I totally agree, I have used livebuild to create my own installation images giving me exactly the system I want (including non-debian software) and it has worked really really well, so much so I rarely need to download iso files anymore
Since the procedure used by Will Haley (https://willhaley.com/blog/custom-debia ... vironment/) is similar to mine, I followed that. I can confirm it WORKS. I successfully created an ISO file that can be started by BIOS and UEFI firmwares. The "nomodeset" kernel option had to be removed for VirtualBox to work. I didn't used live-build, though, so I cannot tell you which procedure is faster or better. However, thank you for your suggestions. Maybe I'll try live-build in the future.