UBUNTU USB INSTALL PROBLEM ON LENOVO T410

I have Ubuntu on my Lenovo T410 and it recently stopped working.

On load up it shows a screen saying ‘GNU GRUB version 2.02’ and then ‘Unable to mount root fs on unknown-block(0,0)’.

I cannot load a new Ubuntu operating system via the usb stick. I created the stick on an old macbook.

How do I resolve this?