Possible Duplicate:

Cannot boot to Ubuntu, though installation was successful

Actually the question says it all, but let me tell you what I did, so u may find exactly what might have went wrong:

I have Win 8 installed on 500 GB HDD.

SO I shrunk it four times for:

partition 1 - the original partition containing Win 8 sys (118GB)

partition 2 - NTFS formatted for my data (188GB)

partition 3 - NTFS formatted for my data (100GB)

partition 4 - NTFS formatted for Linux distro say Ubuntu (I reformatted it to ext4 during Ubuntu installation) (25GB)

partition 5 - NTFS formatted for Linux distro (am thinking to try Mint in it) (21GB)

So now I booted Ubuntu from USB (created from ubuntu-12.04-desktop-amd64.iso) and
deleted last two partitions 4 and 5 to create:

partition 1 - ext4 where I installed Ubuntu (25GB)

partition 2 - Swap (4GB)

partition 3 - unallocated space, not formatted yet (17GB)

Ubuntu installation said it installed successfully and that I have to restart to boot in Ubuntu. But when I restart Windows 8 auto booted - there was no dual boot.

After that I devided above 100GB partition to 80Gb and 20GB ones (since I read online that I should have /home in separate partition for convenience, so I created 20GB partition for it)

So I went on to manually create boot entry using EasyBCD as below show in picture at below link

When I created the entry, FreeBCD showed the information as follows:

Windows Boot Manager

--------------------

identifier              {9dea862c-5cdd-4e70-acc1-f32b344d4795}

device                  partition=DeviceHarddiskVolume2

description             Windows Boot Manager

locale                  en-US

inherit                 {7ea2e1ac-2e61-4728-aaa3-896d9d0a9f0e}

integrityservices       Enable

default                 {ea8167ad-d189-11e1-90e4-ab2f09569dcc}

resumeobject            {ea8167a3-d189-11e1-90e4-ab2f09569dcc}

displayorder            {ea8167ad-d189-11e1-90e4-ab2f09569dcc}

                        {ea8167b1-d189-11e1-90e4-ab2f09569dcc}

toolsdisplayorder       {b2721d73-1db4-4c62-bf78-c548a880142d}

timeout                 10

displaybootmenu         Yes



Windows Boot Loader

-------------------

identifier              {ea8167ad-d189-11e1-90e4-ab2f09569dcc}

device                  partition=C:

path                    Windowssystem32winload.exe

description             Windows 8

locale                  en-US

osdevice                partition=C:

systemroot              Windows

resumeobject            {9bc7fdf7-3ae0-11e2-be77-806e6f6e6963}



Real-mode Boot Sector

---------------------

identifier              {ea8167b1-d189-11e1-90e4-ab2f09569dcc}

device                  partition=C:

path                    NSTAutoNeoGrub0.mbr

description             Ubuntu

Notice the last bolded entry created.

Howevever after thet, when I rebooted it firstly showed old DOS like bootloader (no Windows 8 UI based bootloader) with two entries Windows and Ubuntu.

Windows 8 was booting correctly but I was getting an error while booting Ubuntu taking me to GRUB Rescue.

Update:

Now, I rebuilt Windows bootloader from Windows disk with command bootrec /rebuildbcd. So currently there is no dual boot menu. It loads Windows. Then I booted Ubuntu from Live USB and tried to install GRUB, but it said command not found, so I tried to set path as follows but it did not worked.

This occcured:

ubuntu@ubuntu:~$ sudo grub 

sudo: grub: command not found ubuntu@ubuntu:~$ 

sudo /sbin/grub 

sudo: /sbin/grub: command not found

Is it like that during installation only Ubuntu was installed on the partition but no GRUB were installed. That may be the reason for the failure of auto GRUB bootloader entry (last entry) created by FreeBCD since it is not able to find GRUB in any partition.
This may be the reason for failure of sudo grub.

So what should I do next? Please help am new to Linux world.