docs:fixed the pynvim installation command in quickstart

docs/extensions-plugins/neovim/quickstart.mdx

@@ -26,11 +26,18 @@ In this tutorial, we'll walk you through the process of setting up and using the
 
 A few things to note before you start installing the Pieces Neovim Plugin:
 
-- The Python based Neovim plugins requires the `pynvim` Python package, which is not included in the default Neovim installation. You can install it by running the following command:
+- The Python based Neovim plugins requires the `pynvim` Python package, which is not included in the default Neovim installation. 
+  You can install it in MacOS/Windows by running the following command:
 
     ```bash
     pip install pynvim
     ```
+
+  If you use Ubuntu 22+ or an Ubuntu-based-distro -
+
+    ```bash
+    sudo apt install python3-pynvim
+    ```
 
 - Ensure that you have at least one Neovim package manager installed. For instance, you can install `vim-plug`. 
   In order to install `vim-plug`, run the following command in your terminal: