I have one machine in which Windows8 is already installed and having 3 partitions(one for windows OS). Now i wanted to install Ubuntu12.04, i have tried many times but ubuntu 12.04 installer not able to fine those partitions, even it is not recognise windows partition. please refer the images and please help me to solve this issue.

Somehow i am not able to update images so i am just explain here. "Installation type " window -> this window only shows two options 1)Erase disk and install ubuntu" 2) Something else * here there is no option for "Along with windows 8" option

and in second window of "Installation type" it shows Device : /dev/sda
freespace 500107 MB

*there is nothing else.

but i reality there is three partitions and i wanted to install Ubuntu in other partitions. I don't formate windows8.

I am new with Ubuntu so please help me to install Ubuntu.

Thanks.