Ubuntu – Don’t I have the option ”Install Ubuntu alongside” the other systems?

system-installationubiquity

Why don't I have this option?

enter image description here

here's my disk layout

sudo fdisk -l

Disk /dev/sda: 640.1 GB, 640135028736 bytes
255 heads, 63 sectors/track, 77825 cylinders, total 1250263728 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x5b53cc54

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      409599      203776    7  HPFS/NTFS/exFAT
/dev/sda2          409600  1153767021   576678711    7  HPFS/NTFS/exFAT
/dev/sda3      1216962560  1250050047    16543744    7  HPFS/NTFS/exFAT
/dev/sda4      1250050048  1250261679      105816    c  W95 FAT32 (LBA)

Disk /dev/sdb: 4005 MB, 4005527552 bytes
32 heads, 63 sectors/track, 3880 cylinders, total 7823296 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x20d8782d

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *          63     7822079     3911008+   c  W95 FAT32 (LBA)

Best Answer

The ubiquity installer offers to Install inside Windows when it cannot install alongside. i.e. when you already have 4 primary partitions used. This means that splitting the Windows partition is not possible.

If you select this option, it copies wubi.exe to the Windows Startup folder, so that when you next boot Windows it will automatically run Wubi.

Since you don't want to install with Wubi, you'll need instead to remove one of the primary partitions, and try installing again.

Here is an example of what ubiquity shows (although in this case the user has Windows XP, not Windows 7): enter image description here

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