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When I am trying to boot my PC with Ubuntu via bootable USB, it says it doesn't detect any OS installed and asks to install it on whole hard disk. I want to install it along side my Windows 7 OS.

Boot info here.

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choose manual option, and then you can choose the partiton on which you want to install.

Or simply use wubi.exe to install easily like software installation inside windows.

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You have overlapping partitions.

  1. Backup your documents
  2. via Gparted, delete the sda3, sda5, sda6, sda7 partitions
  3. retry the Ubuntu installation
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