cross-posted from: https://lemy.lol/post/30548063
I have an old hp pavilion dv6 and I installed windows 7. Then i tried installing Ubuntu 24.04 and the USB wouldn't boot, it just showed "GRUB" in the top left of the screen. I tried with another USB and the same issue emerged.
I suggest you flash via etcher and try again. That's usually either a bad flash or secure boot making your life miserable.
It is not the etcher's fault. I tried it w/ another device and it worked just fine.