Ubuntu 14.10 Installation on external hard drive, BOOTMGR is missing

[Abu_Hurayrah]

I'm new to ubuntu. I installed Ubuntu 14.10 on my external toshiba 500Gb hard drive using a live USB and everything went fine except when I was asked to restart and restarted, however I got the message: "BOOTMGR is missing, press CTRl+ALT+DEL to restart". Please help. I'm new to linux and need ubuntu for my course.

[oldfred]

Best to see details.
Download this and run the summary report, post link it gives you.

Boot Repair -Also handles LVM, GPT, separate /boot and UEFI dual boot.:
https://help.ubuntu.com/community/Boot-Repair

You do have to change utopic to saucy as that is still the version of Boot-Repair available. It will still work ok.