I'm trying to install Ubuntu 13.10 alongside Windows 7 on my DELL INSPIRON 14z 5423 laptop and I'm new to all of this.

I'm using the Ubuntu 13.10 64-bit ISO burned onto a CD.

The first time I tried to install it, Ubuntu said it did not detect any other OS, which meant I only had 4 options:

• Erase disk and install Ubuntu (I don't want to do this)
• Encrypt new Ubuntu.
• Use LVM.
• Something else.

If I choose the Something else option, it brings me to the partition menu and says that I have 1 disk with free space of (500Gb), but that's not true because I have Windows 7.

I restarted the laptop several times and booted the CD again and I got exactly the same as I did previously.

How do fix this problem and install Ubuntu alongside Windows 7?

After executing "sudo fdisk -l" command in terminal

ubuntu@ubuntu:~$ sudo fdisk -l

WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.


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: 0xd2b811c5

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      206847      102400    7  HPFS/NTFS/exFAT
/dev/sda2          206848   314574847   157184000    7  HPFS/NTFS/exFAT
/dev/sda3       314574848   629147647   157286400    7  HPFS/NTFS/exFAT
/dev/sda4       629147648   976771071   173811712    7  HPFS/NTFS/exFAT

After removing one partition I executed command once again

ubuntu@ubuntu:~$ sudo fdisk -l

WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.


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: 0xd2b811c5

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      206847      102400    7  HPFS/NTFS/exFAT
/dev/sda2          206848   629145599   314469376    7  HPFS/NTFS/exFAT
/dev/sda3       629147648   976771071   173811712    7  HPFS/NTFS/exFAT