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Gnome Tweaks not installing on Ubuntu 19.10. Error package not found throws up.

Problem:

This error usually shows up when you have just installed Ubuntu 19.10 and then try to install gnome teaks with the following command.

$ sudo apt install gnome-tweak-tool

Solution:

To resolve the above error, execute the following commands on the terminal.

$ sudo apt update

$ sudo add-apt-repository universe

$ sudo apt install gnome-tweak-tool