Install gdisk by entering the following commands in the terminal:
sudo apt update sudo apt install gdisk
Description:
GPT fdisk text-mode partitioning tool
GPT fdisk (aka gdisk) is a text-mode partitioning tool that works on Globally Unique Identifier (GUID) Partition Table (GPT) disks, rather than on the more common (through 2009) Master Boot Record (MBR) partition tables.
Homepage: http://sourceforge.net/projects/gptfdisk/
Version: 1.0.3-1
Section: admin