Here's how you can remove an old kernel and unused packages in Ubuntu, by using Ubuntu Tweak.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each.
sudo add-apt-repository ppa:tualatrix/ppa
sudo apt-get update
sudo apt-get install ubuntu-tweak
3. Open Ubuntu Tweak.
4. Go to the Janitor tool.
5. Click the checkbox to remove old kernels, packages, etc.
6. Click the Clean button.
For more, see the original article at the link below.
How to remove old kernel and unused package from Ubuntu | Fresh Tutorial
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