installation-instructions.md

@@ -79,7 +79,7 @@ to install it.
 
 #### Debian & Ubuntu
 
-For [Debian](http://www.debian.org/) or [Ubuntu](http://www.ubuntu.com/), add the following lines to your `/etc/apt/sources.list`,
+For [Debian](http://www.debian.org/) or [Ubuntu](http://www.ubuntu.com/), add the following line to your `/etc/apt/sources.list`,
 
 ```
 deb [ arch=amd64 ] https://downloads.skewed.de/apt DISTRIBUTION main