diff --git a/UbuntuInstallation.md b/UbuntuInstallation.md
index b6954ef..639eae9 100644
--- a/UbuntuInstallation.md
+++ b/UbuntuInstallation.md
@@ -65,7 +65,7 @@ apt-cache policy libboost-dev
     libboost-python1.48-dev libboost-regex1.48-dev \
     libboost-system1.48-dev libboost-thread1.48-dev
 
-    # On on some systems just:
+    # On some systems just:
     sudo apt-get install \
     libboost-filesystem-dev \
     libboost-program-options-dev \