Linux 설치 중에 하드 디스크가 포맷되어 파티션이 손실되었습니다.

sda1에 Ubuntu 14.04를 설치했습니다. 그러나 설치가 완료되면 모든 파티션이 사라집니다. sda5에 중요한 데이터가 있고 다음 명령을 실행하면 sudo fdisk -l터미널에 다음이 표시됩니다.

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x000cf11e

    Device Boot      Start         End      Blocks   Id  System
 /dev/sda1   *        2048      499711      248832   83  Linux
 /dev/sda2          501758   976771071   488134657    5  Extended
 Partition 2 does not start on physical sector boundary. 
 /dev/sda5          501760   976771071   488134656   8e  Linux LVM

 Disk /dev/mapper/ubuntu--vg-root: 495.6 GB, 495594766336 bytes 255
 heads, 63 sectors/track, 60252 cylinders, total 967958528 sectors
 Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical):
 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096
 bytes Disk identifier: 0x00000000

 Disk /dev/mapper/ubuntu--vg-root doesn't contain a valid partition
 table

 Disk /dev/mapper/ubuntu--vg-swap_1: 4202 MB, 4202692608 bytes 255
 heads, 63 sectors/track, 510 cylinders, total 8208384 sectors Units =
 sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512
 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes
 Disk identifier: 0x00000000

 Disk /dev/mapper/ubuntu--vg-swap_1 doesn't contain a valid partition
 table

총 하드 드라이브 크기는 5ooGB입니다.