Comment 4 for bug 1460521

In fact, I have tried https://github.com/rhinstaller/efibootmgr/commit/301c0628f7fa7333791d2b5d79eb8e02fc848ee7 and it doesn't work for this issue.
I think my fix is the right way to fix this problem so I also made a pull request at https://github.com/rhinstaller/efibootmgr/pull/32 about this.
I have used this patch for some Ubuntu OEM projects and it does work well.

BTW, efibootmgr code base is very different between Ubuntu 14.04, 14.10 and 15.04.
Although Ubuntu 14.10 and 15.04 don't have the duplicate issue, but it still has other issue by the same script in comment #1.
We just didn't see any side effect from that issue yet.