Installation
1. From their website -
Download the .deb package straight away from their website and double click on the file to install it. Their website is ubuntu-tweak.com.
2. By adding the PPA to your repositor -
This is a more recommended way as it is easier to upgrade the version with the new releases.
Step 1: Open your terminal by going to Applications -> Accessories -> Terminal
Step 2: Execute the following instructions in the order
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sudo apt-add-repository ppa:tualatrix/ppa && sudo apt-get update
sudo apt-get install ubuntu-tweak
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Once it is installed, you can find Ubuntu Tweak at Applications -> System Tools -> Ubuntu Tweak.
Ubuntu Tweak is a must have if you are a beginner.