Laptop: Samsung NP900X3C-A01AU
I tried copying an external Windows HD onto the laptop's hard drive. It didn't work well at all.
Now I'm trying to reinstall Xubuntu 20.04 'Focal Fossa' onto the laptop, but every time I boot from the installation USB, the USB's light flickers and then goes out and nothing much happens.
C in the grub menu and entering GNU GRUB 2.04, I tried
linux /casper/vmlinuz initrd /casper/initrd boot
but the USB's light flickered, went out and nothing else happened on an otherwise on-but-blank screen.
What should I have done or do?