As I understand it, the main branch of Clonezilla does not work in UEFI mode. The I tried 20180102-bionic, and during the "ocs-scan-disk" part, it was still unable to detect the NVMe drive.
Unable to detect NVMe drive when booting Clonezilla in UEFI mode
I think SHA256 should be the standard that gets centered around, as the industry has generally moved in that direction. I don't think I've ever seen a SHA3 hash out in the wild by anyone, and as far as I can tell, there may be no practical advantage over SHA2 algorithms.
I think SHA256 should be the standard that gets centered around, as the industry has generally moved in that direction and it's considered unbroken and secure as compared to SHA1 for which a collision has been discovered.
Add SHA256 hashes to Sourceforge's hash preview mechanism?