Ubuntu library install.

README.md

@@ -17,7 +17,7 @@ For manual install, download the `addons` folder from this repository and copy i
 * The 3Dconnexion driver is not needed on any OS. However, if you're on Windows, and have the driver installed, please first open the Godot editor, then open the 3Dconnexion app. You'll see a pop-up with the name of the Godot editor executable. Click `Advanced Settings`, then disable all navigation and zoom controls, as these can conflict with the viewport controls.
 * If you are using a wireless Space Mouse, on Windows, you'll have to make sure only the correct HID device is enabled for the plug-in. First do a Windows Update, and check the Optional Updates for the 3Dconnexion driver. Then open `Device Manager`, click `View` `Devices by container`. You should see an entry for `3Dconnexion Universal Receiver` and underneath `3Dconnexion Wireless Device` which is the driver we just installed. Below that, there may be around 6 entries for `HID-compliant vendor-defined device`. Right-click on each of those and disable them. You will have to click `Yes`, but don't choose `Restart`. Wait until you have disabled all those on the list, then restart your machine.
 ![Screenshot](screenshots/Godot_Space_Mouse_Win_Fix.jpg)
-* On Linux you will need to allow HID access via udev rules. First, download the file `70-space-mouse.rules` from the `addons/spacemouse/bin/` folder and place this file in the correct directory for your distro, such as `/etc/udev/rules.d/`. Then replug your Space Mouse hardware or run `sudo udevadm control --reload-rules && sudo udevadm trigger` to update the rules.
+* On Linux you will need to allow HID access via udev rules. First, download the file `70-space-mouse.rules` from the `addons/spacemouse/bin/` folder and place this file in the correct directory for your distro, such as `/etc/udev/rules.d/`. Then replug your Space Mouse hardware or run `sudo udevadm control --reload-rules && sudo udevadm trigger` to update the rules. For Ubuntu, or related distros, please run this on the command line: `sudo apt install libhidapi-hidraw0`.
 * For macOS, you must uninstall the 3Dconnexion drivers, as they're incompatible with the plug-in.
 * Please note, a Space Mouse or Space Navigator hardware device from 3Dconnexion is required.