GParted не запускается, поврежденная таблица GPT

Я пытаюсь запустить GParted и получить следующую серию ошибок во всплывающих окнах, прежде чем он в конце концов уйдет:

Invalid argument during seek for read on /dev/sda

Libparted Bug Found! The backup GPT table is corrupt, but the primary
appears OK, so that will be used.

Libparted Bug Found! Assertion (last_usable <= disk->dev->length) at
../../../libparted/labels/gpt.c:994 in function _parse_header()
failed.

Ubuntu 14.04 работает как единственная операционная система в Asus Zenbook.

Спасибо!

sgdisk -v output:

Warning! Disk size is smaller than the main header indicates! Loading
secondary header from the last sector of the disk! You should use 'v'
to verify disk integrity, and perhaps options on the experts' menu to
repair the disk. Caution: invalid backup GPT header, but valid main
header; regenerating backup header from main header.

Warning! One or more CRCs don't match. You should repair the disk!

 ****************************************************************************
Caution: Found protective or hybrid MBR and corrupt GPT. Using GPT,
but disk verification and recovery are STRONGLY recommended.
****************************************************************************

Caution: The CRC for the backup partition table is invalid. This table
may be corrupt. This program will automatically create a new backup
partition table when you save your partitions.

Problem: The secondary header's self-pointer indicates that it doesn't
reside at the end of the disk. If you've added a disk to a RAID array,
use the 'e' option on the experts' menu to adjust the secondary
header's and partition table's locations.

Problem: Disk is too small to hold all the data! (Disk size is
250069680 sectors, needs to be 457179648 sectors.) The 'e' option on
the experts' menu may fix this problem.

Problem: GPT claims the disk is larger than it is! (Claimed last
usable sector is 457179614, but backup header is at 457179647 and disk
size is 250069680 sectors. The 'e' option on the experts' menu will
probably fix this problem

Problem: partition 7 is too big for the disk.

Problem: partition 8 is too big for the disk.

Identified 6 problems!