$ sudo add-apt-repository ppa:noobslab/themes
$ sudo apt-get update
$ sudo apt-get install flatabulous-theme
$ sudo add-apt-repository ppa:noobslab/icons
$ sudo apt-get update
$ sudo apt-get install ultra-flat-icons
Use Ubuntu Tweak to change the theme and the icons.
$ wget -q -O - http://archive.getdeb.net/getdeb-archive.key | sudo apt-key add -
$ sudo sh -c 'echo "deb http://archive.getdeb.net/ubuntu xenial-getdeb apps" >> /etc/apt/sources.list.d/getdeb.list'
$ sudo apt-get update
$ sudo apt-get install ubuntu-tweak
$ sudo add-apt-repository ppa:ricotz/docky -y
$ sudo apt-get update
$ sudo apt-get install plank -y
On your ubuntu menu search for "session applications", and add a new entry for Plank with the command plank
like the image below.