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1. Download the DEB Package
Download the .deb package for Ubuntu from https://apps.wordpress.com/desktop/. For version 2.2.0, the file size is 53MB.
2. Install the Package
Copy the .deb file into your HOME directory (where you can see Documents directory) and open your Terminal (press Ctrl+Alt+T) to run this command line:
$ sudo dpkg -i wordpress-com-2-2-0.deb
Change the file name above to your actual file name. When the cursor is back to shell prompt without any error, it means the installation finished.
3. Run the WordPress.com Desktop App
Look for WordPress.com name on your Ubuntu menu. Run it. You will need a WordPress.com account and internet connection to use it.
4. Pin It to Launcher
To run it easier, pin it on your desktop Launcher.