Ubuntu – Ubuntu 13.04 installed but always start only Windows 7

13.04dual-bootgrub2installationwindows 7

I'm tring to install Ubuntu 13.04 on my PC desktop but when i restart my PC, it always starts Windows 7, without asking me which OS would i like to run. I've got 3 HDD on my PC:

1: 200 GB with Win7
2: 500 GB partitioned with 4 GB of Swap, 150 GB of /home and the others GB of root (/)
3: 2 TB of various data.

I think the bootloader is on sda1, and during the installation of Ubuntu 13.04 I can't install a bootloader on that partition (fatal error). What should i do?

Here my log of fdisk:

ubuntu@ubuntu:~$ sudo fdisk -l

Disk /dev/sda: 203.9 GB, 203928109056 bytes
255 heads, 63 sectors/track, 24792 cylinders, total 398297088 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xdf56df56

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *          63   398296937   199148437+   7  HPFS/NTFS/exFAT

WARNING: GPT (GUID Partition Table) detected on '/dev/sdc'! The util fdisk doesn't     support GPT. Use GNU Parted.


Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1  3907029167  1953514583+  ee  GPT
Partition 1 does not start on physical sector boundary.

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x272196e3

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2046     7815167     3906561    5  Extended
/dev/sdb2         7815168   300785663   146485248   83  Linux
/dev/sdb3       300785664   976771071   337992704   83  Linux
/dev/sdb5            2048     7815167     3906560   82  Linux swap / Solaris

Best Answer

  • You should use boot-repair

    1 boot live cd / usb

    2 open a terminal and type

    sudo add-apt-repository ppa:yannubuntu/boot-repair
    
    sudo apt-get update
    
    sudo apt-get install boot-repair boot-sav
    

    2b Click the ubuntu icon (top left) and search boot then run the application called Boot-repair

    3 follow all instructions and enter all commands when prompted

    After this reboot an you will see the grub menu listing your operating systems.

    Heres some documentation https://help.ubuntu.com/community/Boot-Repair

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