Ubuntu – Installation doesn’t detect Windows 7

dual-bootsystem-installationwindows 7

My laptop came with Ubuntu. I removed it to install Windows 7 64-bit. I don't remember if I did anything special, I just formatted the entire hard drive. Now I am trying to install Ubuntu 13.10 alongside Windows, but the Ubuntu installer says:

This computer currently has no detected operating system and gives me 4 options:
• erase disk and install Ubuntu
• encrypt the new Ubuntu…..
• use LVM with ……
• something else

I tried all the solutions I could find.
ran gdisk and for //./partition0 and //./partition1 it shows: 

mbr:mbr only    
bsd: not present    
apm: not present    
gpt: not present

Computer Management shows 5 partition, 4 NTFS and 1 raw 10GB space which I planned to install Ubuntu on.

c:, raw space and system reserved 100MB are primary partitions, other 2 are logical drive.

Secure boot option is disabled in BIOS and Legacy boot is selected.

Please suggest a way to get the job done.

Best Answer

Go to the option 'Something else' .you'll get the partition table.Select the partition you want to install.

enter image description here

Then set the filetype to ext4.Select the format checkbox.Select root '/' as mount point.

Next before installation go to "device for boot loader installation"(see the image) and select the partition you've created just before.then press 'install now'.

After booting with live usb/cd ,Run following command in terminal,

sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update
sudo apt-get install -y boot-repair && boot-repair

provided: boot repair

I hope this will help.

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