[Bug 1695562] Re: (/boot/efi not mounted) package shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Steve Langasek]

Hi Jamie,

On Sat, Jun 03, 2017 at 09:21:35AM -0000, Jamie Sterling wrote:
> Thanks for your response. It seems to be there is a bug in the upgrade
> process from 16.10 to 17.04 because I didn't have this problem before and
> it looks like a fresh install with a newly formatted disk will fix it.

By this, do you mean that you have already formatted the disk and done a
fresh install? (which would remove any debugging information, so we would
close this bug)

The Ubuntu upgrade process does not unmount the /boot/efi mountpoint. 
Previously, we have only seen this as a result of users making local changes
to their /etc/fstab.  The EFI System Partition must be mounted at upgrade
time in order to upgrade the bootloader.  But we would like to know why
yours was not mounted.  For instance, if you were following some howto on
the Internet telling you that you should comment /boot/efi out in your
/etc/fstab, we would want to get that howto corrected, since this is bad
advice.

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https://bugs.launchpad.net/bugs/1695562

Title:
  (/boot/efi not mounted) package shim-signed
  1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

Status in shim-signed package in Ubuntu:
  Incomplete

Bug description:
  This error message always appears when running sudo apt autoremove.

  ProblemType: Package
  DistroRelease: Ubuntu 17.04
  Package: shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1
  ProcVersionSignature: Ubuntu 4.10.0-21.23-generic 4.10.11
  Uname: Linux 4.10.0-21-generic x86_64
  .proc.sys.kernel.moksbstate_disabled: 0
  .sys.firmware.efi.efivars.MokSBStateRT-605dab50-e046-4300-abb6-3dd810dd8b23: Error: [Errno 2] No such file or directory: '/sys/firmware/efi/efivars/MokSBStateRT-605dab50-e046-4300-abb6-3dd810dd8b23'
  .sys.firmware.efi.efivars.SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c: 

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