Due to some reason I had to go with 48 kernel and not 4.4 default one.
After some time I realized that my virtualbox is no longer working… This is one of nice things with Ubuntu.. It works all together flawlessly until you start messing with it (for instance when you need latest software and latest software usually has dependencies on some other latest software).
So for Kernel 4.8 you need Virtualbox 5.1 to install it quickly
wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add - wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
sudo apt-get update sudo apt-get install virtualbox-5.1