Address PR review feedback

Author: rayluo

docs/getting-started.md

@@ -244,14 +244,6 @@ available hardware.
 
 {% include /style/begin-section.html %}
 
-## Step 5.1: Update `apt`
-
-Currently, the image file downloaded from step 1 was built in 2020,
-some of its built-in packages are dated, and `apt` does not work out of the box.
-
-To fix `apt` in general, `/etc/apt/sources.list` needs to be changed to match
-https://github.com/ev3dev/docker-library/blob/master/ev3dev-stretch/layers/debian/etc/apt/sources.list
-
 
 ## Step 6: Connect to the EV3 via SSH
 
@@ -281,6 +273,19 @@ you're good to go!
 
 {% include /style/begin-section.html bg="dark" %}
 
+## Step 6.1: Optional: Update `apt`
+
+Currently, the image file downloaded from step 1 was built in 2020.
+`apt` does not work out of the box.
+
+To fix `apt` in general, `/etc/apt/sources.list` needs to be changed to match
+https://github.com/ev3dev/docker-library/blob/master/ev3dev-stretch/layers/debian/etc/apt/sources.list
+
+Specifically, you can run `sudo nano /etc/apt/sources.list`,
+delete the old content from that file,
+and replace them with the content from the link above.
+
+
 ## Step 7: Choose a programming language and write some code
 
 {% include /style/icon.html type="info" %}