Public bug reported:

linux-modules-extra-4.15.0-29-generic installs virtualbox guest modules
that are newer than what virtualbox-guest-dkms-hwe provides (5.2.8 vs
5.1.34):

$ modinfo 
/lib/modules/4.15.0-29-generic/kernel/drivers/staging/vboxvideo/vboxvideo.ko
filename:       
/lib/modules/4.15.0-29-generic/kernel/drivers/staging/vboxvideo/vboxvideo.ko
license:        GPL and additional rights
description:    Oracle VM VirtualBox Graphics Card
author:         Oracle Corporation
srcversion:     689EDF1E50DE15779B4F930
alias:          pci:v000080EEd0000BEEFsv*sd*bc*sc*i*
depends:        drm,drm_kms_helper,ttm
staging:        Y
retpoline:      Y
intree:         Y
name:           vboxvideo
vermagic:       4.15.0-29-generic SMP mod_unload 
parm:           modeset:Disable/Enable modesetting (int)

$ modinfo /lib/modules/4.15.0-29-generic/kernel/ubuntu/vbox/vboxsf/vboxsf.ko 
filename:       
/lib/modules/4.15.0-29-generic/kernel/ubuntu/vbox/vboxsf/vboxsf.ko
version:        5.2.8_KernelUbuntu r120774
alias:          fs-vboxsf
license:        GPL
author:         Oracle Corporation
description:    Oracle VM VirtualBox VFS Module for Host File System Access
srcversion:     AF89497125574B5225F9B6A
depends:        vboxguest
retpoline:      Y
intree:         Y
name:           vboxsf
vermagic:       4.15.0-29-generic SMP mod_unload 
parm:           follow_symlinks:Let host resolve symlinks rather than showing 
them (int)

$ modinfo 
/lib/modules/4.15.0-29-generic/kernel/ubuntu/vbox/vboxguest/vboxguest.ko 
filename:       
/lib/modules/4.15.0-29-generic/kernel/ubuntu/vbox/vboxguest/vboxguest.ko
version:        5.2.8_KernelUbuntu r120774
license:        GPL
description:    Oracle VM VirtualBox Guest Additions for Linux Module
author:         Oracle Corporation
srcversion:     F2E5886E3B0544500D404A1
alias:          pci:v000080EEd0000CAFEsv00000000sd00000000bc*sc*i*
depends:        
retpoline:      Y
intree:         Y
name:           vboxguest
vermagic:       4.15.0-29-generic SMP mod_unload

Thus installation with dkms fails (while attempting `apt-get install
--reinstall virtualbox-guest-dkms-hwe`):

Building initial module for 4.15.0-29-generic
Done.

vboxguest:
Running module version sanity check.
Error! Module version 5.1.34_Ubuntu for vboxguest.ko
is not newer than what is already found in kernel 4.15.0-29-generic 
(5.2.8_KernelUbuntu).
You may override by specifying --force.

vboxsf.ko:
Running module version sanity check.
Error! Module version 5.1.34_Ubuntu for vboxsf.ko
is not newer than what is already found in kernel 4.15.0-29-generic 
(5.2.8_KernelUbuntu).
You may override by specifying --force.

vboxvideo.ko:
Running module version sanity check.
 - Original module
 - Installation
   - Installing to /lib/modules/4.15.0-29-generic/updates/dkms/

depmod....

DKMS: install completed.


My system does not start correctly with kernel 4.15 and I had to fall back to 
4.13 which has working virtualbox guest modules.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-modules-extra-4.15.0-29-generic 4.15.0-29.31~16.04.1
ProcVersionSignature: Ubuntu 4.13.0-45.50~16.04.1-generic 4.13.16
Uname: Linux 4.13.0-45-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CurrentDesktop: MATE
Date: Tue Jul 24 08:33:57 2018
InstallationDate: Installed on 2015-02-04 (1265 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: linux-hwe
UpgradeStatus: Upgraded to xenial on 2016-08-02 (720 days ago)

** Affects: linux-hwe (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: virtualbox-hwe (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug third-party-packages xenial

** Also affects: virtualbox-hwe (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1783267

Title:
  linux-modules-extra breaks virtualbox guest modules

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