ubuntu@ubuntu:~$ apt-get install gdisk
E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?
ubuntu@ubuntu:~$ sudo apt-get install gdisk
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  gdisk
0 upgraded, 1 newly installed, 0 to remove and 267 not upgraded.
Need to get 336 kB of archives.
After this operation, 760 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu/ saucy/main gdisk amd64 0.8.7-1 [336 kB]
Fetched 336 kB in 1s (235 kB/s)
Selecting previously unselected package gdisk.
(Reading database ... 169077 files and directories currently installed.)
Unpacking gdisk (from .../gdisk_0.8.7-1_amd64.deb) ...
Processing triggers for doc-base ...
Processing 1 added doc-base file...
Processing triggers for man-db ...
Setting up gdisk (0.8.7-1) ...
ubuntu@ubuntu:~$ gdisk
GPT fdisk (gdisk) version 0.8.7

Type device filename, or press <Enter> to exit:
ubuntu@ubuntu:~$ sudo gdisk -l /dev/sda
GPT fdisk (gdisk) version 0.8.7

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sda: 488397168 sectors, 232.9 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 33CCEE22-0E7F-4610-8BDF-8EF1DB8C40FA
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 488397134
Partitions will be aligned on 2048-sector boundaries
Total free space is 2349 sectors (1.1 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048          999423   487.0 MiB   EF00
   2          999424       471980031   224.6 GiB   8300
   3       471980032       488396799   7.8 GiB     8200