Hi, has it already been tested whether a grub-mkrescue ISO boots to a GRUB prompt ?
To try it, install grub-common grub-pc-bin grub-efi-amd64-bin run mkdir minimal touch minimal/empty-file.txt grub-mkrescue -o output.iso minimal and use output.iso like groovy-desktop-amd64.iso. No menu or so is to be expected. Only "grub> _". https://i.stack.imgur.com/DEL0D.jpg ------------------------------------------------------------------------- I really doubt that it makes a difference, but if a grub-mkrescue ISO boots, we could try its pure GPT partition table by xorriso -as mkisofs option -appended_part_as_gpt which produces a "Protective MBR" partition table which indicates a valid GPT. ------------------------------------------------------------------------- If GPT does not boot either, then the difference must be in the EFI partition. Either its storage location or its content. The location could be tested by a stripped-down groovy-desktop-amd64.iso with fewer payload but full boot equipment. About the content of the EFI partition i cannot say much. Have a nice day :) Thomas -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1886148 Title: failure to boot groovy daily To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-cdimage/+bug/1886148/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs