[Bug 1573160] Re: package fwupdate 0.5-2ubuntu4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Richard]

I had it again on upgrade of another system from 14.04 to 16.04

I used:
do-release-upgrade -d

/boot/efi ws mounted ro for some reason. The line in fstab is:
UUID=a369305d-809f-3317-8484-01d6c86315c5 /boot/efi auto defaults 0 3

- the file system was not dirty
- mount -o remount,rw /boot/efi failed with no logging or explanation

get-around:
mount | grep /boot
- note device, mount point and options
umount /dev/sda1 # the device
mount -o relatime,umask=22,uid=0,gid=0,nls=utf8 /dev/sda1 /boot/efi # options less the ro, device and mount point

The installer on continue will display:
Could not install the upgrades 

The upgrade has aborted. Your system could be in an unusable state. A 
recovery will run now (dpkg --configure -a). 

Setting up fwupdate (0.5-2ubuntu4) ...
Installing fwupia32.efi to EFI system partition.
Setting up fwupdate-signed (1.11+0.5-2ubuntu4) ...

Upgrade complete

The upgrade has completed but there were errors during the upgrade 
process. 

To continue please press [ENTER]

Suggested fix:
if fwupdate notices /boot/efi being ro, print this fact and wait for ENTER key.
- the user can then in another terminal fix the problem

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https://bugs.launchpad.net/bugs/1573160

Title:
  package fwupdate 0.5-2ubuntu4 failed to install/upgrade: subprocess
  installed post-installation script returned error exit status 1

Status in fwupdate package in Ubuntu:
  New

Bug description:
  I am not sure what I was doing when this problem occurred

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: fwupdate 0.5-2ubuntu4
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  Date: Tue Apr 19 12:29:57 2016
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1
   apt  1.2.10ubuntu1
  SourcePackage: fwupdate
  Title: package fwupdate 0.5-2ubuntu4 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: Upgraded to xenial on 2016-04-19 (1 days ago)

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