Remove Ubuntu 18.04 and Ubuntu 20.04.

Author: t-paul

downloads.html

@@ -638,16 +638,6 @@ <h3>Raspbian 11 (64-bit only)</h3>
 					<small><code>deb https://download.opensuse.org/repositories/home:/t-paul/Raspbian_11/ ./</code></small>
 				</pre>
 
-				<h3>Ubuntu 18.04</h3>
-				<pre>
-					<small><code>deb https://download.opensuse.org/repositories/home:/t-paul/xUbuntu_18.04/ ./</code></small>
-				</pre>
-			
-				<h3>Ubuntu 20.04</h3>
-				<pre>
-					<small><code>deb https://download.opensuse.org/repositories/home:/t-paul/xUbuntu_20.04/ ./</code></small>
-				</pre>
-			
 				<h3>Ubuntu 22.04 (x86_64, aarch64)</h3>
 				<pre>
 					<small><code>deb https://download.opensuse.org/repositories/home:/t-paul/xUbuntu_22.04/ ./</code></small>