Boot Repair error

[ddhuy]

I cannot manange to get Boot Repair to fix my dual boot of Windows 8 and Ubtuntu. Here is the link with Boot Repair results:
http://paste.ubuntu.com/8170405/

The error I get is:

The boot files of [The OS now in use - Ubuntu 14.04.1 LTS] are far from the start of the disk. Your BIOS may not detect them. You may want to retry after creating a /boot partition (EXT4, >200MB, start of the disk). This can be performed via tools such as gParted. Then select this partition via the [Separate /boot partition:] option of [Boot Repair]. (https://help.ubuntu.com/community/BootPartition)


I have made a seperate partition to use as boot partition (sda8), but in Boot Repair I am unable to select it. I can only use "Seperate /boot/efi partition" and there select the existing efi partition (sda2), the "Speperate /boot partition" is greyed out.

http://i.imgur.com/sDFW0d5.png

http://i.imgur.com/2BpFYu0.png

http://i.imgur.com/kPRjIi7.png

[fantab]

Partition Boot Start Sector End Sector # of Sectors Id System

/dev/sda1 1 500,118,191 500,118,191 ee GPT


GUID Partition Table detected.

Partition Start Sector End Sector # of Sectors System
/dev/sda1 2,048 2,050,047 2,048,000 Windows Recovery Environment (Windows)
/dev/sda2 2,050,048 2,582,527 532,480 EFI System partition
/dev/sda3 2,582,528 2,844,671 262,144 Microsoft Reserved Partition (Windows)
/dev/sda4 2,844,672 266,737,663 263,892,992 Data partition (Windows/Linux)
/dev/sda5 464,097,280 500,117,503 36,020,224 Windows Recovery Environment (Windows)
/dev/sda6 428,077,056 464,097,279 36,020,224 Swap partition (Linux)
/dev/sda7 268,785,664 428,077,055 159,291,392 Data partition (Linux)
/dev/sda8 266,737,664 268,785,663 2,048,000 EFI System partition


parted -l:

Model: ATA SAMSUNG MZ7TD256 (scsi)
Disk /dev/sda: 256GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number Start End Size File system Name Flags
1 1049kB 1050MB 1049MB ntfs hidden, diag
2 1050MB 1322MB 273MB fat32 EFI system partition boot
3 1322MB 1456MB 134MB Microsoft reserved partition msftres
4 1456MB 137GB 135GB ntfs Basic data partition msftdata
8 137GB 138GB 1049MB ext4 boot
7 138GB 219GB 81.6GB ext4
6 219GB 238GB 18.4GB linux-swap(v1)
5 238GB 256GB 18.4GB ntfs hidden, diag

Only one ESP [Efi System Partition] per HDD is recommended.
Also in certain OEM UEFI ESP must be upfront or within the first 100Gb of HDD.

Using Gparted from Live Ubuntu remove the 'boot' flag from the /dev/sda8 partition (the one highlighted in red).

Shutdown. Reboot.