Installation fails on OSX 10.10

[f00]

Hi,

I wanted to upgrade Virtualbox to 5.0.0 but it fails with the following error in the installation log:

Jul 25 11:26:17 ghostship.local installd[427]: PackageKit: Install Failed: Error Domain=PKInstallErrorDomain Code=112 "An error occurred while running scripts from the package “VirtualBox.pkg”." UserInfo=0x7fd81dadb9b0 {NSFilePath=./postflight, NSURL=file://localhost/Volumes/VirtualBox/VirtualBox.pkg#VBoxKEXTs.pkg, PKInstallPackageIdentifier=org.virtualbox.pkg.vboxkexts, NSLocalizedDescription=An error occurred while running scripts from the package “VirtualBox.pkg”.} {
	    NSFilePath = "./postflight";
	    NSLocalizedDescription = "An error occurred while running scripts from the package \U201cVirtualBox.pkg\U201d.";
	    NSURL = "file://localhost/Volumes/VirtualBox/VirtualBox.pkg#VBoxKEXTs.pkg";
	    PKInstallPackageIdentifier = "org.virtualbox.pkg.vboxkexts";
	}

I listened to /var/log/system.log during the installation, which got me:

Jul 25 11:25:41 ghostship.local CoreServicesUIAgent[42425]: Error -60005 creating authorization
Jul 25 11:25:46 --- last message repeated 1 time ---
Jul 25 11:25:46 ghostship.local CoreServicesUIAgent[42425]: Error: qtn_file_apply_to_path error: Read-only file system
Jul 25 11:25:47 ghostship.local Installer[42629]: The function ‘CGContextErase’ is obsolete and will be removed in an upcoming update. Unfortunately, this application, or a library it uses, is using this obsolete function, and is thereby contributing to an overall degradation of system performance.
Jul 25 11:26:11 ghostship.local SecurityAgent[42639]: *Forcing* IMK Distributed Objects (not XPC) in App = com.apple.SecurityAgent, euid=92
Jul 25 11:26:13 ghostship.local SecurityAgent[42639]: The function ‘CGContextErase’ is obsolete and will be removed in an upcoming update. Unfortunately, this application, or a library it uses, is using this obsolete function, and is thereby contributing to an overall degradation of system performance.
Jul 25 11:26:16 ghostship.local UserEventAgent[331]: com.apple.TMHelperAgent.SetupOffer enabled
Jul 25 11:26:16 ghostship kernel[0]: Can't unload kext org.virtualbox.kext.VBoxUSB; classes have instances:
Jul 25 11:26:16 ghostship kernel[0]: Kext org.virtualbox.kext.VBoxUSB class org_virtualbox_VBoxUSB has 1 instance.
Jul 25 11:26:16 ghostship kernel[0]: Kext org.virtualbox.kext.VBoxUSB class org_virtualbox_VBoxUSBClient has 2 instances.
Jul 25 11:26:16 ghostship kernel[0]: Can't remove kext org.virtualbox.kext.VBoxDrv; services failed to terminate - 0xdc008018.
Jul 25 11:26:16 ghostship.local com.apple.kextd[46]: Can't load /Library/Application Support/VirtualBox/VBoxDrv.kext - a different version is already loaded.
Jul 25 11:26:17 ghostship.local UserEventAgent[331]: com.apple.TMHelperAgent.SetupOffer enabled
Jul 25 11:26:17 ghostship.local Installer[42629]: Die Installation ist aufgrund eines Fehlers fehlgeschlagen. Wenden Sie sich an den Hersteller der Software.

[Frank Mehnert]

Please reopen if still relevant with VBox 5.0.4.