This can mean several things.
- It may mean that the USB stick is faulty
- The .iso burn to bootable drive failed
- The download was corrupted or not downloaded from a reliable source
What etcher did you use to burn the .iso to teh USB to make a bootable copy? Unetbootin? Balena? Rufus?
Did you download from Zorin.com?
Did you check the 256SHA?