[Bug 1768695] Re: package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1

[Qi Xin]

Using Live_USB with reinstall option can fix the dependencies errors, even there was a grub2 error. After I reboot system, the grub2 error with shim-signed and grub-efi-amd64-signed errors.
I use `sudo apt install grub-pc` to solve the shim-signed error, and I found x86_64-efi directory's name changed to i386-pc.
And then I use the following solution to fixed the grub-refi-amd64-signed error:
```
sudo mount /dev/sda5 /mnt # 把root分区挂在/mnt目录，你可以通过ll /mnt查看其内容应该与ll /显示的是一样的内容
sudo mount /dev/sda1 /mnt/boot/efi # 挂在efi分区到引导目录中，挂在这一步你可以对比ll /mnt/boot/efi挂在前后的区别

sudo mount --bind /dev /mnt/dev
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys /mnt/sys

sudo chroot /mnt

apt-get install grub-efi-amd64
grub-install --recheck --no-floppy --force

echo "configfile (hd0,gpt#)/boot/grub.cfg" > /boot/efi/ubuntu/grub.cfg # 告诉grub从/boot加载grub.cfg
update-grub # 建立grub菜单列表
exit # 退出chroot模式

### 卸载挂在分区 ###
sudo umount /mnt/dev
sudo umount /mnt/proc
sudo umount /mnt/sys
sudo umount /mnt/boot/efi
sudo umount /mnt/boot
```
After those two processing, there is no errors about efi.
Maybe there are some bugs in auto-upgrading from 16.04 LTS to 18.04 LTS. So I met some errors with `apt` method for upgrading.

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Title:
  package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade:
  installed shim-signed package post-installation script subprocess
  returned error exit status 1

Status in shim-signed package in Ubuntu:
  Invalid

Bug description:
  Report details:
  when I upgrade from 16.04 LTS to 18.04 LTS at May 2, 2018 with the following commands:
      1. sudo apt update
      2. sudo apt upgrade
      3. sudo apt dist-upgrade
      4. sudo apt install update-manager-core
      5. sudo do-release-upgrade -d

  I met the lots of dependencies broken errors, and then I try to use a commond to fix the errors following:
      1. sudo apt-get install -f
  it's doesn't work.

  So I try to reinstall the 18.04 LTS with USB IOS method, there is an
  issues at install grub2 processing, there is a message popped up and
  can't close it, so I power off and reboot manually.

  The previous grub2 still works, I choose the first ubuntu option and login the 18.04 LTS system.
  Finally crashed report popped up and I submit this report.

  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: shim-signed 1.34.9+13-0ubuntu2
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  .proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] No such file or directory: '/proc/sys/kernel/moksbstate_disabled'
  ApportVersion: 2.20.9-0ubuntu7
  AptOrdering:
   shim:amd64: Install
   shim-signed:amd64: Install
   NULL: ConfigurePending
  Architecture: amd64
  BootEFIContents:
   fw
   fwupx64.efi
  Date: Thu May  3 09:17:36 2018
  EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2: EFI variables are not supported on this system.
  EFITables: 5月 03 09:28:44 qixin fwupd[3028]: disabling plugin because: failed to startup uefi: UEFI firmware updating not supported
  ErrorMessage: installed shim-signed package post-installation script subprocess returned error exit status 1
  Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
  PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
  RelatedPackageVersions:
   dpkg 1.19.0.5ubuntu2
   apt  1.6.1
  SourcePackage: shim-signed
  Title: package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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