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