Public bug reported:

WHen building kernel 4.2.0-36 dkms fails to build (​#1487605)
This issue also exist on Ubuntu 15.04 (8.0.39) but the version from LTS 14.04 
is r8168-8.037.00-1.

A patch for the issue is available that can be easily applied to fix the
issue.

This is a severe issue as it breaks networking on my Notebook using this
kernel. Older kernel version of 4.2.0 did not break the build.

 DKMS make.log for r8168-8.037.00 for kernel 4.2.0-36-generic (x86_64)
 Do 2. Jun 08:13:21 CEST 2016
 make: Verzeichnis »/usr/src/linux-headers-4.2.0-36-generic« wird betreten
   LD      /var/lib/dkms/r8168/8.037.00/build/built-in.o
   CC [M]  /var/lib/dkms/r8168/8.037.00/build/r8168_n.o
 /var/lib/dkms/r8168/8.037.00/build/r8168_n.c: In function 
‘rtl8168_tx_vlan_tag’:
 /var/lib/dkms/r8168/8.037.00/build/r8168_n.c:2705:12: error: implicit 
declaration of function ‘vlan_tx_tag_present’ 
[-Werror=implicit-function-declaration]
      tag = (vlan_tx_tag_present(skb)) ?
             ^

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: r8168-dkms 8.037.00-1
ProcVersionSignature: Ubuntu 3.13.0-86.131-generic 3.13.11-ckt39
Uname: Linux 3.13.0-86-generic x86_64
NonfreeKernelModules: wl fglrx
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
DKMSKernelVersion: 4.2.0-36-generic
Date: Thu Jun  2 08:13:49 2016
DuplicateSignature: 
dkms:r8168-dkms:8.037.00-1:/var/lib/dkms/r8168/8.037.00/build/r8168_n.c:2705:12:
 error: implicit declaration of function ‘vlan_tx_tag_present’ 
[-Werror=implicit-function-declaration]
InstallationDate: Installed on 2014-06-08 (724 days ago)
InstallationMedia: Ubuntu-Studio 14.04 LTS "Trusty Tahr" - Release amd64 
(20140416.3)
PackageArchitecture: all
PackageVersion: 8.037.00-1
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.6
 apt  1.0.1ubuntu2.14
SourcePackage: r8168
Title: r8168-dkms 8.037.00-1: r8168 kernel module failed to build
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: r8168 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package need-duplicate-check third-party-packages trusty

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https://bugs.launchpad.net/bugs/1588173

Title:
  r8168-dkms 8.037.00-1: r8168 kernel module failed to build [error:
  implicit declaration of function ‘vlan_tx_tag_present’]

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