So I'm upgrading from a 4gb card to a 64gb card. I took an image of my (highly configured) 4gb card and I've written it to my 64gb. However, the 64gb card isn't utilizing all its space, there's still 60gb that aren't part of a partition. I created a partition for those missing 60gb and popped the card in my Pi, but it ended up getting stuck in a boot loop.
How can I increase the partition size of the root partition?