installation - Installed Ubuntu for dual-boot only Windows comes up (tried boot-repair)

On my computer I have a dual-boot of Windows 7 and Ubuntu 12.10. Ubuntu was just installed from a USB flash drive.

After the installation finishes, my computer boots straight to Windows without any indication that either GRUB or Ubuntu is even installed. If I boot from the USB drive again, the install screen shows up as if I didn't install it.

I've tried boot-repair and got: link to paste.ubuntu.com

And this is what I tried to repair:

sudo chroot "/mnt/boot-sav/sda7" dpkg --configure -a

sudo chroot "/mnt/boot-sav/sda7" apt-get install -fy

sudo chroot "/mnt/boot-sav/sda7" apt-get purge -y --force-yes grub*-common shim* linux-signed*