[Bug 1575305] Re: Ubuntu system broken after upgrade from 15.10 to 16.04

[Steve Langasek]

Your fstab shows this commented-out line:

##/dev/mapper/isw_cacfjebbfc_Volume0p2 /boot/efi       vfat
umask=0077      0       1

Your fdisk output does not list any /dev/mapper/isw_cacfjebbfg_Volume0
device.

isw refers to Intel Software RAID.

Did you previously have your system configured to use Intel Software
RAID, then disable this manually without reinstalling?

You must have an EFI System Partition for Ubuntu to properly manage the
bootloader on an EFI system.  According to your fdisk output, you have
several possible candidates for this: /dev/sda2, /dev/sdb2, /dev/sdc2
(which I believe were previously part of the isw RAID mirror and likely
have the same contents), and /dev/sdd2.

If you can run 'sudo efibootmgr -v', it may be possible to figure out
from the existing entry which disk you are booting from and that you
should mount as /boot/efi.

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https://bugs.launchpad.net/bugs/1575305

Title:
  Ubuntu system broken after upgrade from 15.10 to 16.04

Status in shim-signed package in Ubuntu:
  Incomplete

Bug description:
  After unfortunate click on upgrade to 16.04 my system is now almost
  useless (fortunately enough I can still work with a windows 10 VM.. )

  Seems like grub is failing to find efi folder so there is an avalanche
  of broken things - from shim to unity.

  I'll try to open from the broken system and add some more information.

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