Fatal error: ExtPack.xml': Invalid version string: 5.0.0_Ubuntu'

[dino99]

This has happened since the virtualbox 5.0 upgrade
Now when i try to load a .vdi guest (which was working fine with the previous version) i'm getting that error:

Executable: /usr/lib/virtualbox/VirtualBox
Process ID: 25023
Package type: LINUX_32BITS_GENERIC (OSE)
Installed Extension Packs:
VNC (Version: 5.0.0 r101573; VRDE Module: VBoxVNC)
Oracle VM VirtualBox Extension Pack (Version: 5.0.0 r101573; VRDE Module: VBoxVRDP)
Oracle VBoxDTrace Extension Pack (Version: r0; VRDE Module: unusable because of 'Failed to load '/usr/lib/virtualbox/ExtensionPacks/Oracle_VBoxDTrace_Extension_Pack/ExtPack.xml': Invalid version string: 5.0.0_Ubuntu')
Console: Machine state changed to 'Starting'

....and i get a fatal error dialog box, and the process abort.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: virtualbox 5.0.0-dfsg-1ubuntu2
ProcVersionSignature: Ubuntu 4.2.0-4.4-generic 4.2.0-rc6
Uname: Linux 4.2.0-4-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.18-0ubuntu6
Architecture: i386
CurrentDesktop: GNOME
Date: Thu Aug 13 18:50:04 2015
SourcePackage: virtualbox
UpgradeStatus: No upgrade log present (probably fresh install)