So when the image is being uploaded/created, it tells you the size of the image upload. Is this Partition 2 the full size that it’s copying, or is there free space? Next question would be, what kind of Hard Drive is the 500 GB? Meaning, is it SATA/AHCI or SATA/IDE in the bios? Is it a Solid State, Solid State Hybrid, or regular Platter drive?
This is important, as through some of my testing, I’ve found that, especially hybrid SSD, actually causes my kernel to crash because it can’t open a solid read/write stream to the drive. It keeps hanging and will give this pigz error anywhere between 2 minutes, to 10 minutes into the image upload cycle.