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I installed the 2.6.32-32-generic-pae kernel over my existing 2.6.32-32-generic kernel.

This solved the problem I had with the system not showing the full amount of RAM, but it has had a side-effect. I can't start my VirtualBox VMs. I get this message:

Kernel driver not installed (rc=-1908)
Please install the virtualbox-ose-dkms package and execute 'modprobe vboxdrv' as root

virtualbox-ose-dkms was already installed and when I ran sudo modprobe vboxdrv, I got another error message:

FATAL: Module vboxdrv not found.

I purged virtualbox-ose-dkms (complete removal) and then re-installed it, but I still got the same error.

I then repeated the full re-installation, but this time with the previous non-pae kernel. It works, but fails when I reboot into the pae kernel.

Next I uninstalled and then re-installed VirtualBox into the pae system, but it gave the same error.

What can I do to get VirtualBox running with the pae kernel?

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possible duplicate of Unable to Install VirtualBox Due to Missing Kernel Module – Lekensteyn Jun 19 '11 at 19:42
I've treid the suggeston in the above-mentioned possible duplicate... I purged linux-headers-2.6.38-8-generic and installed linux-headers-2.6.38-8-generic-pae .. I still get the error. – Peter.O Jun 19 '11 at 20:00
You need to install the headers matching your kernel version. See the updated answer. – Lekensteyn Jun 19 '11 at 20:04
I never had issues when installing Virtual Box from the repository maintained by Oracle: see this answer – Takkat Jun 19 '11 at 20:15
I got it!.. thanks... I think I was installing things in the wrong order... This worked for me... After purging, I installed in this order: sudo apt-get install linux-headers-2.6.32-32-generic-pae,then sudo apt-get install virtualbox-ose, (The reverse order didn't work) – Peter.O Jun 19 '11 at 20:28
up vote 2 down vote accepted

The issue was solved thanks to the comments to the question... VirtualBox is working again... by uninstalling and re-installing things in the correct sequence.. (I've "answered" in this way, as there was no other specific answer...)

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