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I'm trying to set up a dual boot for Windows 7 and Ubuntu 13.04. Windows 7 was already installed on my computer. Then, I shrunk the C:/ hard drive partition. Then, I used a USB flash drive to install Ubuntu 13.04 alongside Windows 7. The installation completed succesfully. Also, there now exists hard drive partition(s?) for Ubuntu. I do not have any other operating systems than Windows 7 and Ubuntu 13.04. enter image description here

However, when I restarted my computer (after the successful installation) my computer acts as if Ubuntu isn't there. It just starts up into Windows. And if I restart it again and again, it still starts up into Windows. If I make is start up from the USB flash drive, and choose to install Ubuntu alongside my current operating systems, then it wants me to make a second Ubuntu. How can I boot from Ubuntu?

I've tried going into 'choose hardware to boot from'. The only options are my hard disk (which boots into Windows) and my pendrive (which if I boot from it, it just wants me to install another Ubuntu). How can I boot into my successfully installed Ubuntu?

I'm using 64-bit Ubuntu and 64-bit Windows 7 Home Premium. Hardware involved are 8GB RAM, 64-bit Operating System, Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz, HP Pavilion g4 Notebook PC.

By the way, I used persistence Ubuntu in the USB flash drive although I know that it's not supposed to work. I used LinuxLive USBCreator 2.8.23 to 'create' the USB flashdrive.

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Related: askubuntu.com/questions/264780/… –  raindrop Jul 16 '13 at 2:59
likely the boot loader was not installed properly, if you are being asked to install another Ubuntu, then the first install is there you just need to install the boot loader to get it booted. See this answer and follow the link to Boot Repair, it is the easiest way to get the boot loader installed. –  TrailRider Jul 16 '13 at 3:01
Possible duplicate of Cannot boot to Ubuntu, though installation was successful –  TrailRider Jul 16 '13 at 3:03
@TrailRider Thanks, I used the Boot Repair and now the Ubuntu-windows7 dual boot works perfectly fine. –  raindrop Jul 16 '13 at 4:45
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