Why grub2 wont boot from external hdd?

TigerShark

I installed ubuntu 13.10 from a bootable live usb stick into a new 2tb usb hdd. The drive came with a 100mb "raw" partition and a ntfs one. I deleted the ntfs and created an ext4 and swap (sde3 and sde5). Installation completed successfully but when trying to boot from the usb hdd, grub starts as expected but soon enters rescue mode. I've read some questions here and some forum topics but cant figure out this....

boot-repair output just in case http://paste.ubuntu.com/6705167/

The usb drive is dev/sde. I have a lot a hdds and a fake raid but don't bother looking at them, pretend my pc has no internal drives. All I want is to be able to have a "non-live" bootable ubuntu on a external drive's partition.

Thx in advance.

ps: already seen links https://askubuntu.com/questions/282512/how-to-move-ubuntu-12-04lts-from-usb-to-hdd Why can't I boot from portable HD? Can I install ubuntu to a partition on my portable hard drive? HELP! Booting Ubuntu off Portable HDD, lots of issues with GRUB

oldfred

Line 580 is not showing your files.Normally Boot-Repair sees them and then when far on drive like yours must be gives a warning about far from start of drive. Some combination of BIOS and particularly USB large drives have issues with boot files being far into drive. There was a fixed bug on very large / (root) partitions, but there still issues. Best to create a small 10 to 25GB / (root) or even smaller 500MB /boot totally within the first 100GB of an external drive.

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