[Bug 1685984] [NEW] packages (multiple) failed to install/upgrade: unable to open 'xxxxx.dpkg-new': Operation not permitted

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Happening with VSCode install, linux-image-extra-4.8.0 and more.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: linux-image-4.8.0-49-generic (not installed)
ProcVersionSignature: Ubuntu 4.8.0-46.49~16.04.1-generic 4.8.17
Uname: Linux 4.8.0-46-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
Date: Tue Apr 25 13:34:27 2017
DuplicateSignature:
 package:linux-image-4.8.0-49-generic:(not installed)
 Unpacking linux-image-4.8.0-49-generic (4.8.0-49.52~16.04.1) ...
 dpkg: error processing archive /var/cache/apt/archives/linux-image-4.8.0-49-generic_4.8.0-49.52~16.04.1_amd64.deb (--unpack):
  unable to open '/boot/vmlinuz-4.8.0-49-generic.dpkg-new': Operation not permitted
ErrorMessage: unable to open '/boot/vmlinuz-4.8.0-49-generic.dpkg-new': Operation not permitted
InstallationDate: Installed on 2017-04-18 (6 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt  1.2.19
SourcePackage: linux-hwe
Title: package linux-image-4.8.0-49-generic (not installed) failed to install/upgrade: unable to open '/boot/vmlinuz-4.8.0-49-generic.dpkg-new': Operation not permitted
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: dpkg (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-package xenial
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packages (multiple) failed to install/upgrade: unable to open 'xxxxx.dpkg-new': Operation not permitted
https://bugs.launchpad.net/bugs/1685984
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