Ubuntu Tweak PPA, install the official Ubuntu Tweak on Ubuntu 15.04, Ubuntu 14.04 and Ubuntu 14.10. Ubuntu Tweak is a Ubuntu Desktop (Unity) customization tool.
Ubuntu Tweak is an application to config Ubuntu easier for everyone. It provides many useful desktop and system options that the default desktop environment doesn’t provide.
Install Ubuntu Tweak
To install Ubuntu Tweak, run the following commands:
$ sudo add-apt-repository ppa:tualatrix/ppa
$ sudo apt-get update
$ sudo apt-get install ubuntu-tweak
Once installed, open Ubuntu Tweak from Ubuntu Dash. Type “Ubuntu Tweak”(without quotes) and click on the icon to open Ubuntu Tweak.
If you are unable to install Ubuntu Tweak on Ubuntu 15.04 using the Terminal Commands, download and install the Deb file from here Ubuntu-Tweak_0.8.7.deb