Try flashing the image onto the USB using another tool. You also can try the dd command in Linux (do be careful using dd though)
e.g.
dd if=ubuntu.iso of=/dev/sda bs=8M status=progress
Make sure to replace /dev/sda with your USB drive's path.
well, I tried it w/ Balena etcher and it didn't work, but it did on another laptop. I believe the fault is in the old computer.
Aight.
It may be an issue with the bios not setting up the USB drive like grub expects.... Maybe try booting with uefi if you can?
I think those symptoms mean it's loading the first stage of grub but them grub can't find the rest of itself
I second AsudoxDev's idea that it may be worth using a different flash tool or a different USB drive if you can't get it working.
It might be that , since it used to work with W7, that UEFI is not implemented (or at least not default).
If that is the case, try to install Ubuntu on your drive using rufus or ventoy. Iirc, at least one of them has a support for legacy booting.
Then comes the hard part : I'm not sure that GRUB will install itself in legacy mode. You have to try to know...
Yes, I will try. Thanks.
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