RedNotebook is a free cross-platform desktop diary and journal software written with Python and GTK+3. It lets you format, tag and search your entries. You can also add pictures, links and customizable templates, spell check your notes, and export to plain text, HTML, Latex or PDF.

The software has an official stable PPA that contains the latest packages for Ubuntu 18.04 and Ubuntu 16.04 so far. And below will show you how to add the PPA and install RedNotebook.

1. Open terminal either via Ctrl+Alt+T keyboard shortcuts or by searching for ‘terminal’ from software launcher.

2. Copy and paste following command into terminal and hit run to add the RedNotebook PPA:

sudo add-apt-repository ppa:rednotebook/stable

Type your password (no asterisks feedback due to security reason) when it prompts and hit Enter.

3. Finally check updates and install the desktop journal software by running following 2 commands one by one:

sudo apt update 

sudo apt install rednotebook

Ubuntu 18.04 users can skip sudo apt update command since it’s already done while adding PPA.

Uninstall:

To remove RedNotebook desktop journal, open terminal and run command:

sudo apt remove --autoremove rednotebook

And remove the PPA via Software & Updates utility -> Other Software tab.