This guide will help you to have a better experience with ElementaryOS
Elementary OS come out-of-box with a large set of applications available from the AppCenter. The ElementaryOS developers believe that this set of application will provide you a great user experience and you may not need any other third-party application installed on your OS. Thus, it does not have the 'add-apt-repository' installed on your system.
But, it is quite easy to install it on your EOS.
sudo apt install software-properties-common software-properties-gtk
Once you've installed it, you will be able to add PPA repositories on the Ubuntu Way using the GUI bellow, or through the good-old command line app 'add-apt-repository'.
sudo add-apt-repository ppa:philip.scott/elementary-tweaks &&
sudo apt update &&
sudo apt install elementary-tweaks
My current desktop looks like the bellow image. If you like it all you have to is follow the bellow steps.
Use the commands bellow to add the arc-theme to your repository. Note that you should do this manually, once the PPA (at the date of this writing) is only available for Ubuntu 16.10.
sudo sh -c "echo 'deb http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04/ /' > /etc/apt/sources.list.d/arc-theme.list"
sudo apt-get update
sudo apt-get install arc-theme
sudo rm /etc/apt/sources.list.d/arc-theme.list
sudo apt update
Now, lets install the awesome Paper Icon Set on your system.
sudo add-apt-repository ppa:snwh/pulp
sudo apt-get update
sudo apt-get install paper-icon-theme
Open the Elementary Tweaks, go to the Appearance tab ( Applications > Tweaks > Appearance ). Now, change the GTK+ theme to Arc, and the Icons to Paper.
looks hella clean