Same, here, this message makes me fear that my system won't be able to
boot with the new kernel.

Setting up linux-signed-image-4.4.0-51-generic (4.4.0-51.72) ...
warning: file-aligned section .text extends beyond end of file
warning: checksum areas are greater than image size. Invalid section table?

This seems related? https://bugs.launchpad.net/launchpad/+bug/1071562

This suggests it isn't as serious as it sounds? http://www.rodsbooks.com
/efi-bootloaders/secureboot.html. However, no actual explanation.

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https://bugs.launchpad.net/bugs/1540406

Title:
  warning: file-aligned section .text extends beyond end of file

Status in linux-signed package in Ubuntu:
  Confirmed

Bug description:
  When running a dist-upgrade, I received the following warning:

  Setting up linux-signed-image-4.4.0-2-generic (4.4.0-2.16) ...
  warning: file-aligned section .text extends beyond end of file
  warning: checksum areas are greater than image size. Invalid section table?

  Note: I've tried booting the kernel with dmesg enabled, it seems to
  boot just fine. See
  https://launchpadlibrarian.net/235948033/CurrentDmesg.txt for when I
  booted it.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-signed-image-4.4.0-2-generic 4.4.0-2.16
  ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3
  Uname: Linux 4.3.0-7-generic x86_64
  ApportVersion: 2.19.4-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Feb  1 15:58:45 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-11-28 (65 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151127)
  SourcePackage: linux-signed
  UpgradeStatus: No upgrade log present (probably fresh install)

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