README + installer assumes tfb user is allowed to run sudo

README.md

@@ -25,6 +25,7 @@ $ sudo apt-get install openssh-server
 * If Ubuntu is already installed, run the following command and follow the prompts.
 ```bash
 $ sudo adduser tfb
+$ sudo usermod -a -G sudo tfb
 ```
 * Log in as `tfb`
 * Fully update **NOTE**: If you update the kernel (linux-firmware), it is generally a good idea to reboot aftewards.