failed during xubuntu upgrade from 17.04 to 17.10 package shim-signed 1.32+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[nilshalvard]

I have no idea what the problem was. just got the error during distribution upgrade from xubuntu 17.04 to 17.10

ProblemType: Package
DistroRelease: Ubuntu 17.10
Package: shim-signed 1.32+0.9+1474479173.6c180c6-1ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
Uname: Linux 4.13.0-25-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
.proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] No such file or directory: '/proc/sys/kernel/moksbstate_disabled'
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
Date: Sun Jan 14 23:07:36 2018
EFITables:
 jan. 14 23:12:06 zrg kernel: efi: EFI v2.40 by American Megatrends
 jan. 14 23:12:06 zrg kernel: efi: ACPI=0x78821000 ACPI 2.0=0x78821000 SMBIOS=0xf0000 SMBIOS 3.0=0xf0020 ESRT=0x792d2018 MEMATTR=0x75dfe018
 jan. 14 23:12:06 zrg kernel: esrt: Reserving ESRT space from 0x00000000792d2018 to 0x00000000792d2050.
 jan. 14 23:12:06 zrg kernel: Secure boot could not be determined
ErrorMessage: subprocess installed post-installation script returned error exit status 1
GrubDiff: Binary files /boot/efi/EFI/ubuntu/grubx64.efi and /usr/lib/grub/x86_64-efi-signed/grubx64.efi.signed differ
InstallationDate: Installed on 2018-01-03 (11 days ago)
InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
Python3Details: /usr/bin/python3.6, Python 3.6.3, python3-minimal, 3.6.3-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.14, python-minimal, 2.7.14-2ubuntu1
RelatedPackageVersions:
 dpkg 1.18.24ubuntu1
 apt 1.5.1
SecureBoot: 6 0 0 0 0
SourcePackage: shim-signed
Title: package shim-signed 1.32+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to artful on 2018-01-14 (0 days ago)

[Steve Langasek (vorlon)]

The error in your log is:

Installing for x86_64-efi platform.
grub-install: error: cannot open `/boot/grub/x86_64-efi/core.efi': Operation not permitted.
dpkg: error processing package shim-signed (--configure):
 subprocess installed post-installation script returned error exit status 1

This looks like filesystem corruption. What filesystem do you have mounted at /boot? Please show the output of 'mount | grep /boot'.

[Launchpad Janitor (janitor)]

[Expired for shim-signed (Ubuntu) because there has been no activity for 60 days.]