The Unity Tweak Tool is an essential tool for Ubuntu desktop. It allows you to customize a ton of UI features like Workspace Settings, Hotcorners, Scrolliong, Themes, Switchers, and Icons.
To install Unity Tweak, open terminal and run:
$ sudo install unity-tweak-tool
Depending on your Linux Distro, you may get an error that looks something like this:
The following schema is missing com.canonical.notify.osd
If this happens open terminal and run the following:
sudo apt-get install notify-osd
sudo apt-get install overlay-scrollbar