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[ubuntu] Installed ubuntu as sole OS, but when I reboot the computer does not detect an OS

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Hi all, I recently decided to install Ubuntu 13.04 and I had decided to remove Windows entirely, so I let Ubuntu take over the entire HDD and installed in the live session. However, upon rebooting I was prompted with a message that said "No Operating System Found". I then tried Boot repair ( link: http://paste.ubuntu.com/5623317/ ) and it gave me the following recommendation:

Quote:

Please do not forget to make your BIOS boot on sda1/EFI/ubuntu/shimx64.efi file!


Honestly, I don't know how to do that last part and that's why I need your help, since the original problem persists. If it helps, I own a VAIO computer and I tried finding out what my motherboard model is through the command

Code:

sudo dmidecode -t 0
and the output was


Code:

# dmidecode 2.11
# SMBIOS entry point at 0xca81a418
SMBIOS 2.7 present.

Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
    Vendor: American Megatrends Inc.
    Version: R0201V5
    Release Date: 12/20/2012
    Address: 0xF0000
    Runtime Size: 64 kB
    ROM Size: 5120 kB
    Characteristics:
        PCI is supported
        PNP is supported
        BIOS is upgradeable
        BIOS shadowing is allowed
        ESCD support is available
        Boot from CD is supported
        Selectable boot is supported
        BIOS ROM is socketed
        EDD is supported
        8042 keyboard services are supported (int 9h)
        CGA/mono video services are supported (int 10h)
        ACPI is supported
        USB legacy is supported
        AGP is supported
        Smart battery is supported
        BIOS boot specification is supported
        Function key-initiated network boot is supported
        Targeted content distribution is supported
        UEFI is supported
    BIOS Revision: 2.1
    Firmware Revision: 2.1

I also tried going straight into the BIOS and the only menu I can think could help me is the one dealig with PK keys, but I honestly don't feel confident enough to fiddle with anything until I learn more about this.

Any help would be greatly appreciated. Thank you for your time

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