- https://serverfault.com/questions/96592
- https://unix.stackexchange.com/questions/44234
- https://serverfault.com/questions/4906
- https://serverfault.com/a/853753
- https://serverfault.com/a/796767
It is recommended that you only have 2 partitions, boot and root, and that your boot partition is located before your root partition.
Use seperate live OS and follow steps in order.