I got a new ACER predator AG3620-UR308 which came with windows 8 and I wanted to run ubuntu 12.04.2 on it as a dual boot machine. The box came with 2TB HDD. So I made 4 partitions with a raw partition just after the windows installation partition.

I created a swap area and finished the installation. GRUB was installed on the only drive there which is /dev/sda.

After reboot, GRUB doesn't even come up. It always boots Windows 8. I repeated installation process twice and got the same result. I disabled secure boot from the BIOS and enabled CSM (don't even know what it means) according to Acer custhelp site . I boot from USB and got this:

$ sudo fdisk -l

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



Disk /dev/sda: 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: 0x8c361cb5



Device Boot      Start         End      Blocks   Id  System

/dev/sda1               1  3907029167  1953514583+  ee  GPT

Partition 1 does not start on physical sector boundary.



Disk /dev/sdb: 8178 MB, 8178892800 bytes

255 heads, 63 sectors/track, 994 cylinders, total 15974400 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: 0x0006a87e



Device Boot      Start         End      Blocks   Id  System

/dev/sdb1   *        2048    15972351     7985152    b  W95 FAT32

Can anybody shed some light? thank you in advance

EDIT

I just did another trial with 13.04 this time and still no luck.

bios: secure-boot: disabled   

enable CSM : always 

• Deleted previous Ubuntu partition and swap area partition.now having free space


• Used usb installer to prepare usb with ubuntu-13.04-desktop-amd64.iso


• rebooted : liveusb didnt detect windows 8, used something else


• created partition ext4 for /


• created partition for swap-area


• default grub path is /dev/sda and clicked install

Acer always boots into windows.

NEW EDIT

After following the boot-repair suggestion installed on the liveUSB, I can now see grub but can't log into windows anymore as it's not in the list. The boot-repair also completed with an error, i guess logged on pastin.ubuntu

How my drive is organized