Am 22.04.2023 um 19:30 schrieb mick.crane: > I suspect the GPU is suspect because there are small blocks of pixels > appearing where they aren't wanted. > I'd like to re-install the OS as I've got copies of everything I think. > Just to see if it's maybe a driver issue. > Thing is I can't get the f12 options screen of the PC to let me boot > from a CD in this EFI mode what's grub done. > How can I boot from CD in this EFI mode? > > mick > >
My neighbor has an old laptop without a CD drive. But there is a linux running (ubuntu). So what i did is this: i did download (and check) an ISO-file to boot from (debian- or ubuntu- live versions) and googled for the appropriate stanza for grub to handle booting from that ISO file. Then i did modify the /etc/grub.d/41_custom file, to make sure, grub will include that stanza on update-grub automatically. But if you only want to boot it only once, you could - on boot, while seeing the grub menu, enter "c" to open a command line and enter the necessary commands by hand. (I liked to learn, what grub has to offer for cases of emergency. Can come in handily, if you - or a friend - gets stuck on boot.) BTW: IIRC, grub is able to start an efi-shell, if needed, to force boot options that way. But my neighbor did not have uefi. Whereas I do, and - although i am lazy and prefer automation, i had to boot up manually via UEFI several times. What i am saying is: it is possible, but not exactly trivial. Learning is involved and desirable. Have fun DdB
