我想在我朋友的 HP 笔记本电脑上安装 Ubuntu 14.04，该笔记本电脑已安装 Windows。我插入 Live USB 并重新启动笔记本电脑。然后我尝试安装 Ubuntu，但安装过程未找到任何操作系统（但有 Windows 10）。当我选择something else选项时，我注意到它显示硬盘已满free space（但有 5 个分区，并且可以通过 GUI 访问）。对于这种不一致的情况，我退出了安装。
有谁能够帮助我？
编辑
ubuntu@ubuntu:~$ sudo fdisk -l /dev/sda
WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 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: 0x9daac03c
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 718847 358400 7 HPFS/NTFS/exFAT
/dev/sda2 718848 274434047 136857600 7 HPFS/NTFS/exFAT
/dev/sda3 274434048 694204415 209885184 7 HPFS/NTFS/exFAT
/dev/sda4 694204416 1953521663 629658624 f W95 Ext'd (LBA)
/dev/sda5 694206464 1113976831 209885184 7 HPFS/NTFS/exFAT
/dev/sda6 1113978880 1533749247 209885184 7 HPFS/NTFS/exFAT
/dev/sda7 1533751296 1953521663 209885184 7 HPFS/NTFS/exFAT
ubuntu@ubuntu:~$ sudo gdisk -l /dev/sda
GPT fdisk (gdisk) version 0.8.8
Caution: invalid backup GPT header, but valid main header; regenerating
backup header from main header.
Partition table scan:
MBR: MBR only
BSD: not present
APM: not present
GPT: damaged
Found valid MBR and corrupt GPT. Which do you want to use? (Using the
GPT MAY permit recovery of GPT data.)
1 - MBR
2 - GPT
3 - Create blank GPT
Your answer: 1
Disk /dev/sda: 1953525168 sectors, 931.5 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 2D49C476-E1D2-48FB-A46D-85D99282AAA8
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 1953525134
Partitions will be aligned on 2048-sector boundaries
Total free space is 11629 sectors (5.7 MiB)
Number Start (sector) End (sector) Size Code Name
1 2048 718847 350.0 MiB 0700 Microsoft basic data
2 718848 274434047 130.5 GiB 0700 Microsoft basic data
3 274434048 694204415 200.2 GiB 0700 Microsoft basic data
5 694206464 1113976831 200.2 GiB 0700 Microsoft basic data
6 1113978880 1533749247 200.2 GiB 0700 Microsoft basic data
7 1533751296 1953521663 200.2 GiB 0700 Microsoft basic data
ubuntu@ubuntu:~$ sudo fixparts /dev/sda
FixParts 0.8.8
Loading MBR data from /dev/sda
NOTICE: GPT signatures detected on the disk, but no 0xEE protective partition!
The GPT signatures are probably left over from a previous partition table.
Do you want to delete them (if you answer 'Y', this will happen
immediately)? (Y/N):
引导修复程序的输出是这里