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[Lorens <lorens.kockum@xxxxxxxxx>]

If this isn't really simple to find and correct, it may be important
that I remember having restarted the install. Maybe the install doesn't
set the flags immediately, and won't set them if it finds a previous
partitioning?

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https://bugs.launchpad.net/bugs/1416634

Title:
  installer failed to set boot flag on UEFI

Status in linux package in Ubuntu:
  Confirmed
Status in ubiquity package in Ubuntu:
  New

Bug description:
  Hi,

  I installed Ubuntu 14.10 but it wouldn't boot, it took several hours
  to get a working system. I've managed, but I'd just like to document
  this because I couldn't find any relevant writeups online and the
  problem seems so simple that I'm surprised it just didn't work out of
  the box.

  I received a new Acer Aspire E1-572G, I took out the pre-installed
  Windows disk (after just checking that it booted OK) and replaced it
  with a blank SSD. I dd'd the 64-bit 14.10 to a USB key. I got the ISO
  last week from www.ubuntu.com, and most of the files on it are dated
  Oct 22.

  After booting (with some difficulties detailed at
  http://ubuntuforums.org/showthread.php?t=2263270) I installed Ubuntu,
  entire disk encrypted LVM (it's a laptop after all), rebooted... and
  nothing: "No bootable device -- insert boot disk and press any key". I
  tried with UEFI instead of Legacy, and I get a different error message
  (text graphics reminiscent of linux kernel make menuconfig) but same
  meaning, nothing bootable found.

  I booted the live USB to check that the disk looked OK (a half gig
  "Microsoft basic" partition, then a small 244MB linux partition, then
  the rest as a Linux partition. I followed the boot-repair doc on
  <https://help.ubuntu.com/community/Boot-Repair>, and I used default
  repair, no good. <http://paste.ubuntu.com/9959580>

  The installer needed to put the bootable flag on the "Microsoft Basic"
  partition, and maybe change the type to EFI also. Now that I've done
  that, my laptop boots OK with Legacy or UEFI without secure boot (and
  with secure boot it finds the bootable partition and says that the
  security policy blocks it, which is better than totally ignoring it
  like it did before). I don't understand why the installer didn't do
  that, maybe a problem with choosing encrypted LVM?

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