diff --git a/source/docs/en/1.1.0/developer/install-dependencies-ubuntu.markdown b/source/docs/en/1.1.0/developer/install-dependencies-ubuntu.markdown
index baa50a95..e7e7e875 100644
--- a/source/docs/en/1.1.0/developer/install-dependencies-ubuntu.markdown
+++ b/source/docs/en/1.1.0/developer/install-dependencies-ubuntu.markdown
@@ -71,6 +71,10 @@ Graphical interface dependencies:
 - libnotify-dev
 - libwebkitgtk-3.0-dev
 
+Additional Ubuntu 18.04 LTS graphical interface dependencies:
+
+- gstreamer1.0-libav
+
 Install dependencies.
 
     sudo apt-get update
@@ -84,4 +88,8 @@ To build the GTK [GUI](abbr:Graphical User Interface), install the graphical int
 
     sudo apt-get install intltool libappindicator-dev libdbus-glib-1-dev libglib2.0-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgtk-3-dev libgudev-1.0-dev libnotify-dev libwebkitgtk-3.0-dev
 
+If you are running Ubuntu 18.04 LTS, install the additional graphical interface dependencies.
+
+    sudo apt-get install gstreamer1.0-libav
+
 Ubuntu is now prepared to build HandBrake. See [Building HandBrake for Linux](build-linux.html) for further instructions.
diff --git a/source/docs/en/latest/developer/install-dependencies-ubuntu.markdown b/source/docs/en/latest/developer/install-dependencies-ubuntu.markdown
index e95c90c7..b61c42a1 100644
--- a/source/docs/en/latest/developer/install-dependencies-ubuntu.markdown
+++ b/source/docs/en/latest/developer/install-dependencies-ubuntu.markdown
@@ -60,6 +60,7 @@ Dependencies:
 
 Graphical interface dependencies:
 
+- gstreamer1.0-libav
 - intltool
 - libappindicator-dev
 - libdbus-glib-1-dev
@@ -78,6 +79,6 @@ Install dependencies.
 
 To build the GTK [GUI](abbr:Graphical User Interface), install the graphical interface dependencies.
 
-    sudo apt-get install intltool libappindicator-dev libdbus-glib-1-dev libglib2.0-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgtk-3-dev libgudev-1.0-dev libnotify-dev libwebkitgtk-3.0-dev
+    sudo apt-get install gstreamer1.0-libav intltool libappindicator-dev libdbus-glib-1-dev libglib2.0-dev libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgtk-3-dev libgudev-1.0-dev libnotify-dev libwebkitgtk-3.0-dev
 
 Ubuntu is now prepared to build HandBrake. See [Building HandBrake for Linux](build-linux.html) for further instructions.