[email protected] wrote: > >Cannot install Debian 12 'Bookworm' in my desktop computer. (Not yet ready >to learn 13 'Trixie'.) To do so I need to find somebody with a computer to >download file 'debian-12.15.0-amd64-netinst.iso' and then 'burn' it on >either a DVD or CD optical disk. The nearest other computer is owned by one >of my grandson, a 'MAK laptop'. He downloaded the file and 'burned' it to a >DVD using a portable optical disk drive. Then I opened the desktop, put the >disk in the desktop optical drive, and restarted it. All that happened: the >BIOS appeared. That is all.
There are multiple possible ways this could have happened - maybe faulty media, or the ISO was not written correctly. Or maybe your machine can only boot CD media andn won't boot DVD media - we don't have enough information to go on here immediately. >I still have an older optical disk for Debian 12 dated 2015-06-19. Are you sure of thate date? *2015* is 11 years ago, while the first release of Debian 12 (aka "bookworm") was June 2023. >This one is faulty and so cannot complete the installation. It is >however useful for testing subsequent installations. This one did not >open the BIOS; instead right after the desktop opened a full blue >screen appeared with the word ERROR at the top. The next line said >'Verification failed: (Ox1A) Security Violation. Then on hitting the >OK in the middle of the screen the BIOS returned. So what this means is that your system is booting using UEFI, and you have Secure Boot enabled. Older versions of the GRUB bootloader (used on both our installation media and on installed systems) have been blocked from execution on Secure Boot systems due to security holes that were found in it. You will need to use a newer installation medium here where those bugs are fixed. That includes the 12.15.0 version mentioned above, or (better) 13.7.0 (aka "trixie") which is our current stable release and better supported. >So why would the desktop reject the current installer but accepted the >obsolete one even if it was incomplete? See my guesses above. >What has to be done to activate the current one? As your system is modern enough to be using Secure Boot, it will definitely be capable of booting directly from a USB stick as people elsewhere in this thread have suggested. I'd suggest trying one of those instead as it's much easier and faster to use than a CD/DVD these days. The Debian installation guide chapter at https://www.debian.org/releases/trixie/amd64/ch04s03.en.html might help you here. -- Steve McIntyre, Cambridge, UK. [email protected] Can't keep my eyes from the circling sky, Tongue-tied & twisted, Just an earth-bound misfit, I...
