Notion doesn't have an official desktop app for Ubuntu which is a bit sucky. Fortunately, there's a neat open-source GitHub repository that allows you to install Notion for Ubuntu/Debian.
I managed to install Notion successfully on Ubuntu 20.04.1 but the following process should also work for other relatively new Ubuntu versions or Debian derivatives.
1. Install Node.js and NPM
You need Node.js and NPM installed. I am not sure what minimum version of Node is required but I managed to install Notion successfully using Node 14.5.4. Use a Node version manager like NVM to easily install a more recent Node version if the installation doesn't work.
2. Install other package dependencies
In the terminal, run the following:
sudo apt install p7zip-full imagemagick fakeroot make g++
p7zip-full is at least version 16.
3. Download the Notion .deb file
Grab the latest
.deb release from the releases page.
4. Install the
In the terminal, navigate to where you downloaded the
.deb file and install it using dpkg:
sudo dpkg -i notion-desktop_2.0.11_amd64.deb
Make sure to replace the .deb file name with the one you downloaded.
That's it! Notion should now be a desktop app on your Ubuntu machine. Tada!