thank you continuum!
I did copy the linode.img file over to an Ubuntu 14.05.5 server and run this command: sgdisk -p linode.img
this is the output:
Creating new GPT entries.
Disk linode.img: 100147200 sectors, 47.8 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): B1C5B678-3FE2-41AF-A915-744C3ECBFAAE
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 100147166
Partitions will be aligned on 2048-sector boundaries
Total free space is 100147133 sectors (47.8 GiB)
Number Start (sector) End (sector) Size Code Name