Cloning VirtualBox vmdk to vdi

First of all you have to shutdown VirtualBox machine that you wan’t to clone.
After that create new folder where you wan’t to clone existing vmdk machine to vdi

After that run this command in terminal:

Wait until the job is done and… that’s all.

VirtualBox problem with kernel headers on Fedora 21

Yesterday i have moved from Ubuntu 14.04 to Fedora 21. I have installed all software needed including VirtualBox (for Windows 7).
When I was trying to start

I have got this error

The solution for that was to install kernel-devel which solved the problem.

Ubuntu 13.04 (64-bit) and VirtualBox 4.2 extension pack installation problem

Today i have reinstalled my company workstation to Ubuntu 13.04 Raring Ringtail. After that i have installed VirtualBox 4.2 and wanted to install extension pack from VirtualBox homepageĀ Oracle_VM_VirtualBox_Extension_Pack-4.2.16-86992.vbox-extpack. So I went to File->Preferences->Extensions and clicked Add package… and after that i have got error message like this:

After googling the net i have found a solution for that which was:


Closing the VB and starting it again solved the problem.

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