gdisk binary package in Ubuntu Mantic i386

 GPT fdisk (aka gdisk) is a text-mode partitioning
 tool that provides utilities for Globally Unique
 Identifier (GUID) Partition Table (GPT) disks.
 .
 Features:
 .
  - Edit GUID partition table definitions
  - In place conversion of BSD disklabels to GPT
  - In place conversion of MBR to GPT
  - In place conversion of GPT to MBR
  - Create hybrid MBR/GPT layouts
  - Repair damaged GPT data structures
  - Repair damaged MBR structures
  - Back up GPT data to a file (and restore from file)

Source package