VirtualBox 5.0 installation has broken VirtualBox packages on Kubuntu 15.04

Remove older VirtualBox versions before installing VirtualBox-5.0 !

Uninstall VirtualBox -> sudo apt-get purge "^virtualbox-.*"

Carefully check what will be removed (before you confirm it).

Update the software repositories -> sudo apt-get update

Clean up -> sudo apt-get autoremove && sudo apt-get autoclean && sudo apt-get clean

Download and register the ORACLE public key ->

wget -q -O - https://www.virtualbox.org/download/oracle_vbox.asc | sudo apt-key add -

Add the VirtualBox repo to the software sources ->

echo "deb http://download.virtualbox.org/virtualbox/debian $(lsb_release -sc) contrib" | sudo tee /etc/apt/sources.list.d/oracle-vbox.list

Now update the software repositories again -> sudo apt-get update

Install VirtualBox -> sudo apt-get install dkms virtualbox-5.0

Note for other users who use a newer Ubuntu edition than 15.04 :

As of Ubuntu 16.04 the ORACLE public key to download has changed.

oracle_vbox.asc has to be replaced with oracle_vbox_2016.asc

My Virtualbox does not work. It starts but could not execute any of the machines. The solution I found was:

sudo apt-get install virtualbox-dkms

and then:

sudo modprobe vboxdrv

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