Install virtualbox on Linux and the extension pack from https://www.virtualbox.org/wiki/Download_Old_Builds_5_0 using:

sudo apt-get install virtualbox-5.0
wget http://download.virtualbox.org/virtualbox/5.0.20/Oracle_VM_VirtualBox_Extension_Pack-5.0.20-106931.vbox-extpack

create default vm directory in home directory

mkdir ~/VM

Start virtualbox, add the extension using file, preferences, extensions, add and point it to the downloaded file.