I bought recently this laptop, and it comes with a digital pen. Ubuntu 20.04 detects the pen. What all apps can I use to utilize the pen?
For taking notes
To draw and take notes, you can use Xournal++, an actively maintained free and open source program.
(Image credit - Xournal++ readme)
Enter the following commands in a terminal to install it from its stable PPA.
sudo add-apt-repository ppa:apandada1/xournalpp-stable sudo apt update sudo apt install xournalpp
Alternatively, you can use the .deb package, or the flatpak version, as described in the readme of the project.
You can use Krita to draw and create professional graphics. It has a lot of features. Many tutorials are available online (and also in youtube).
sudo apt install krita
Disclaimer: I am not affiliated with the development of either Krita or Xournal++, but I am the maintainer of the stable PPA for Xournal++.