Virtualbox guest additions isn't working properly in Ubuntu 16.04

[Ｖ字龍(Vdragon)]

## Symptoms ##
* OpenGL processing offloading is not supported(3D hardware acceleration is enabled in VM settings and is available on Intel Graphics host)
* VBoxClient warns about "Failed to connect to the ViratualBox kernel service, rc=VERR_ACCESS_DENIED"(refer attached screenshot)

You may checkout the screen record for what exactly this issue is about:
https://www.youtube.com/watch?v=aB1sb3D4Q9g

## Workarounds ##
Install VirtualBox provided guest additions iso from the menu works

## Additional Information ##
* I uses the VirtualBox from upstream on the host side, the version is 5.0.20
* Note that the Ubuntu Kernel bundled with 16.04 has integrated VirtualBox guest modules(vboxguest, vboxsf, and vboxvideo specifically) for unknown reason, this bug is reproduced *without* the virtualbox-guest-dkms package(since the Additional Drivers interface doesn't provide me the option to do so(the option is greyed-out, refer attached screenshot))
* I have another 14.04 VM and it's OpenGL offloading works, so it's not likely that the host isn't providing proper OpenGL functionallity

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: virtualbox-guest-x11 5.0.18-dfsg-2build1
ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Wed May 11 12:08:31 2016
InstallationDate: Installed on 2016-01-07 (124 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: virtualbox
UpgradeStatus: Upgraded to xenial on 2016-04-07 (33 days ago)

[Gianfranco Costamagna (costamagnagianfranco)]

Hi, can you please try my ppa?
https://launchpad.net/~costamagnagianfranco/+archive/ubuntu/virtualbox-ppa

[Ｖ字龍(Vdragon) (vdragon)]

@LocutusOfBorg, why should I try your ppa? It doesn't provide any guest-side packages and there's even no xenial ones.

What have you change in your packages that may be related to this issue?

[Gianfranco Costamagna (costamagnagianfranco)]

ough, seems that I forgot to push it :)

yes, it does provide the guest packages.

[Gianfranco Costamagna (costamagnagianfranco)]

packages will be available in an hour or two.

[Gianfranco Costamagna (costamagnagianfranco)]

Indeed, you need to install virtualbox-guest-utils, not virtualbox-guest-x11 directly.
this will pick up virtualbox-guest-dkms and fix the issue.

[Ｖ字龍(Vdragon) (vdragon)]

@LocutusOfBorg
I've tested the PPA, and here's the result:
https://www.youtube.com/watch?v=QmQt0VIpBuc

I still encountering the VERR_ACCESS_DENIED issue until I install the previously not installed virtualbox-guest-dkms package, however the 3D offloading problem still exist.

About the virtualbox-guest-dkms package, I'm not sure it is really needed in 16.04 as xenial kernel already packs virtualbox's guest modules(you can lsmod it even without installing the package)

[Gianfranco Costamagna (costamagnagianfranco)]

I'm not sure about this bug, I didn't have such issue with the kernel module from src:linux, neither with the one from src:virtualbox.

[Gianfranco Costamagna (costamagnagianfranco)]

I know they are provided, but probably a little bit outdated

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Ron Tackaberry (retackaberry)]

"About the virtualbox-guest-dkms package, I'm not sure it is really needed in 16.04 as xenial kernel already packs virtualbox's guest modules(you can lsmod it even without installing the package)"

Actually, I had the same problem. Installing this package solved it. Error gone and pasting and screen resize is now working fine.

Thanks for the help.

[Sven (5-launmhpad-t)]

I think, this bug is related to #1619277.