unknown version of the X Window System installed. Not installing X Window System drivers.

[Chris Murphy]

When installing Guest Additions in Fedora 21 (prerelease) I get a message: Warning: unknown version of the X Window System installed. Not installing X Window System drivers.

xorg-x11-server-Xorg-1.16.0-1.fc21.x86_64

[root@twenty1v log]# /run/media/chris/VBOXADDITIONS_4.3.14_95030/VBoxLinuxAdditions.run Verifying archive integrity... All good. Uncompressing VirtualBox 4.3.14 Guest Additions for Linux............ VirtualBox Guest Additions installer Removing installed version 4.3.14 of VirtualBox Guest Additions... Copying additional installer modules ... Installing additional modules ... Removing existing VirtualBox DKMS kernel modules [ OK ] Removing existing VirtualBox non-DKMS kernel modules [ OK ] Building the VirtualBox Guest Additions kernel modules [ OK ] Doing non-kernel setup of the Guest Additions [ OK ] You should restart your guest to make sure the new modules are actually used

Installing the Window System drivers Warning: unknown version of the X Window System installed. Not installing X Window System drivers.

[ OK ]

Installing graphics libraries and desktop services componen[ OK ]

[Chris Murphy]

[root@twenty1v log]# cat VBoxGuestAdditions.log

Starting vboxadd (via systemctl):  [  OK  ]
Starting vboxadd-service (via systemctl):  [  OK  ]
Starting vboxadd-x11 (via systemctl):  [  OK  ]



[root@twenty1v log]# cat VBoxGuestAdditions.log

Starting vboxadd (via systemctl):  [  OK  ]
Starting vboxadd-service (via systemctl):  [  OK  ]
Starting vboxadd-x11 (via systemctl):  [  OK  ]
[root@twenty1v log]# cat vboxadd-install.log
Uninstalling modules from DKMS
Attempting to install using DKMS

Creating symlink /var/lib/dkms/vboxguest/4.3.14/source ->
                 /usr/src/vboxguest-4.3.14

DKMS: add completed.

Kernel preparation unnecessary for this kernel.  Skipping...

Building module:
cleaning build area...
make KERNELRELEASE=3.16.0-1.cmlb729fdm810v4.fc21.x86_64 -C /lib/modules/3.16.0-1.cmlb729fdm810v4.fc21.x86_64/build M=/var/lib/dkms/vboxguest/4.3.14/build.........
cleaning build area...

DKMS: build completed.

vboxguest:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/3.16.0-1.cmlb729fdm810v4.fc21.x86_64/extra/

vboxsf.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/3.16.0-1.cmlb729fdm810v4.fc21.x86_64/extra/

vboxvideo.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/3.16.0-1.cmlb729fdm810v4.fc21.x86_64/extra/
Adding any weak-modules

depmod....

DKMS: install completed.
Creating user for the Guest Additions.
Creating udev rule for the Guest Additions kernel module.

[Chris Murphy]

Rats, poor first round search. Just found https://www.virtualbox.org/ticket/13207. This is a duplicate!