[Bug 1575813] Re: Dual boot does not work after upgrade to 16.04

[Martin Pitt]

What I don't understand is the line with the long UUID for /boot/efi:

  #UUID=b032ab5d-1a06-4b52-afcb-14954b4b6ab8 /boot/efi /dev/sda1:
PARTLABEL= defaults 0 1

this would suggest that at some point the EFI partition  was formatted some ext* or other Linux fs instead of the normal VFAT (for
which a commented out entry also exists). How did you install this system, in particular which partitioning option did you chose? If you did manual partitioning, what exactly did you do? Is it possible that you changed the EFI partition manually?

Can you please run "sudo blkid" and paste the output here?

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https://bugs.launchpad.net/bugs/1575813

Title:
  Dual boot does not work after upgrade to 16.04

Status in shim-signed package in Ubuntu:
  Invalid

Bug description:
  I upgraded from 15.10 to 16.04. The process was not completed
  apparently due a problem with shim-signed. I now find the following
  message every time I try to update the system:

  Setting up shim-signed (1.12+0.8-0ubuntu2) ...
  Installing for x86_64-efi platform.
  grub-install: error: cannot find EFI directory.
  dpkg: error processing package shim-signed (--configure):
   subprocess installed post-installation script returned error exit status 1
  Errors were encountered while processing:
   shim-signed
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  Furthermore, I have a dual boot system with Windows and Ubuntu but
  only the latter works. Something seems to have gone south with UEFI. I
  attach the efibootmgr output. My /etc/fstab looks as follows

  # <file system> <mount point>   <type>  <options>       <dump>  <pass>
  # / was on /dev/sda10 during installation
  UUID=5cc07bc2-7247-40b6-8290-7edef8b4a39d /               ext4    errors=remount-ro 0       1
  # /boot was on /dev/sda9 during installation
  #UUID=b22addc5-b969-47bf-a154-f91b6a137dd6 /boot           ext4    defaults        0       2
  # /home was on /dev/sda11 during installation
  UUID=0aa517c8-aed2-446f-91c2-ecb573598a6d /home           ext4    defaults        0       2
  # swap was on /dev/sda8 during installation
  #UUID=64342e46-54ea-46bf-826e-5667367e2301 none            swap    sw              0       0
  /dev/mapper/cryptswap1 none swap sw 0 0
  UUID=b22addc5-b969-47bf-a154-f91b6a137dd6	/boot	ext4	defaults	0	2
  #UUID=5251-F902	/boot/efi	vfat	defaults	0	1
  #UUID=b032ab5d-1a06-4b52-afcb-14954b4b6ab8	/boot/efi	/dev/sda1: PARTLABEL=	defaults	0	1

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