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I already tried: closing all processes of VirtualBox via KSysGuard and then running: sudo apt-get remove virtualbox-5.1, sudo apt-get install virtualbox-5.1, sudo apt-get purge virtualbox-5.1, sudo apt-get install virtualbox-5.1, sudo vboxconfig, virtualbox. And then adding the extension in the VirtualBox preferences.

This does not get it installed nor does following the command-line instructions for installing it here.

Instead I only get VBoxSVC consuming 25% of my CPU. I get the following error when closing VirtualBox after trying that:

Failed to open the Extension Pack ../Oracle_VM_VirtualBox_Extension_Pack-5.1.26-117224.vbox-extpack.
Callee RC: NS_ERROR_ABORT (0x80004004)

and

Qt WARNING: QWidgetWindow(0x55f9acf151f0, name="UIGlobalSettingsExtensionWindow") must be a top level window.
Qt WARNING: No node found for item that was just removed: QUrl("file:///home/user/Downloads/hqdefault.jpg")
Qt WARNING: QWidgetWindow(0x55f9ace32ef0, name="UIGlobalSettingsExtensionWindow") must be a top level window.

when doing it via the command-line.

/var/log/syslog earlier had (besides some martian packets):

kernel: SUP_IOCTL_COOKIE: Version mismatch. Requested: 0x2a0000 Min: 0x2a0000 Current: 0x240000

and (var/log/kern.log) has:

kernel: VBoxNetFlt: Successfully started.
kernel: VBoxNetAdp: Successfully started.
kernel: VBoxPciLinuxInit
kernel: vboxpci: IOMMU not found (not registered)

I already this problem earlier but got it working. These problems don't look normal.

Why can't I install the Extension Pack and how can I get it working?

  • Have you installed a new kernel after your last boot? – Hauke Laging Sep 6 '17 at 22:54
  • No. At least not deliberately. But I installed and uninstalled a driver once but not in the last couple days. What's a good way to check? – mYnDstrEAm Sep 6 '17 at 23:01
  • Download the extensions pack from the virtualbox.org system, and login to the root user, I believe all you have to do is to open the extensions pack. – mdpc Sep 6 '17 at 23:25
  • HaukeLaging That was the reason for why I had to reinstall VirtualBox actually. @mdpc I have sudoers rights. I won't run GUI programs like VirtualBox as root which is good practice. The vbox-extpack file is owned by my user. I know I have to open it which doesn't help if that doesn't work. – mYnDstrEAm Sep 7 '17 at 7:20
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The solution was: I had to give execute permissions for the owner to the .vbox-extpack file. For some reason it had execution rights unchecked. (I also had this problem when downloading the file via wget instead of via the browser.)


I then had to do this to get VMs working again. Until then I got this error (which is also the reason I reinstalled VirtualBox):

RTR3InitEx failed with rc=-1912 (rc=-1912)

The VirtualBox kernel modules do not match this version of VirtualBox. The installation of VirtualBox was apparently not successful. Executing

'/sbin/vboxconfig'

may correct this. Make sure that you do not mix the OSE version and the PUEL version of VirtualBox.

where: supR3HardenedMainInitRuntime what: 4 VERR_VM_DRIVER_VERSION_MISMATCH (-1912) - The installed support driver doesn't match the version of the user.

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