[Bug 1792497] Re: package shim (not installed) failed to install/upgrade: subprocess dpkg-deb --control returned error exit status 2

[Steve Langasek]

I see; the version of dpkg in trusty-updates does support control.tar.xz
(dpkg 1.17.5ubuntu5.8; LP: #1730627), but the version of dpkg in the
trusty release pocket does not.  So testing on an up-to-date trusty
environment would not hit this bug.

This can be fixed by either a versioned pre-dependency on dpkg >=
1.17.5ubuntu5.8, or by changing the shim packaging to use gz compression
for control.tar instead of the current default xz.

Either solution requires a round-trip to Microsoft for binary signing,
since we must update the shim package.  (Unless the reproducible binary
handling of shim is now so good that we can reuse the existing
signature?)

If we have to do a round-trip for shim signing, it may help as a short-
term workaround to add a pre-dependency on dpkg to the shim-signed
package.  It's not guaranteed to give the correct ordering but it may be
sufficient to solve the problem for many users.

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https://bugs.launchpad.net/bugs/1792497

Title:
  package shim (not installed) failed to install/upgrade: subprocess
  dpkg-deb --control returned error exit status 2

Status in shim package in Ubuntu:
  Triaged

Bug description:
  This happened just after installing ubuntu 14.04.5 LTS along side with windows 10.
  The installation was complete and no login loop issue was there.

  Moreover , the system stated an error due to shim not being installed.
  The two screen monitor is not working and the other monitor is black..

  ProblemType: Package
  DistroRelease: Ubuntu 14.04
  Package: shim (not installed)
  ProcVersionSignature: Ubuntu 4.4.0-135.161~14.04.1-generic 4.4.140
  Uname: Linux 4.4.0-135-generic x86_64
  .proc.sys.kernel.moksbstate.disabled: 0
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  BootEFIContents:
   grub.cfg
   grubx64.efi
   mmx64.efi
   shimx64.efi
  Date: Fri Sep 14 11:30:55 2018
  EFITables:
   Sep 14 11:32:42 plp-ROS kernel: [    0.000000] efi: EFI v2.50 by American Megatrends
   Sep 14 11:32:42 plp-ROS kernel: [    0.000000] efi:  ACPI 2.0=0x8ea21000  ACPI=0x8ea21000  SMBIOS=0x8f644000  SMBIOS 3.0=0x8f643000  ESRT=0x8a498698 
   Sep 14 11:32:42 plp-ROS kernel: [    0.000000] esrt: Reserving ESRT space from 0x000000008a498698 to 0x000000008a4986f8.
  ErrorMessage: subprocess dpkg-deb --control returned error exit status 2
  InstallationDate: Installed on 2018-09-14 (0 days ago)
  InstallationMedia: Ubuntu 14.04.5 LTS "Trusty Tahr" - Release amd64 (20160803)
  RelatedPackageVersions:
   dpkg 1.17.5ubuntu5.7
   apt  1.0.1ubuntu2.14
  SecureBoot: 6   0   0   0   0
  SourcePackage: shim
  Title: package shim (not installed) failed to install/upgrade: subprocess dpkg-deb --control returned error exit status 2
  UpgradeStatus: No upgrade log present (probably fresh install)

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