Try if you can install Ubuntu Tweak app without having to add any new repository. Ubuntu Tweak is a must have app under Ubuntu, it is used to tweak some settings under ubuntu.
sudo apt-get install ubuntu-tweak
If you are not able to install then, follow the step:
1. sudo add-apt-repository ppa:tualatrix/ppa
2. sudo apt-get update
3. sudo apt-get install ubuntu-tweak
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