fixed broken "compile bazel from source"  in "ubuntu" page

Closes #3052.

PiperOrigin-RevId: 157210157
diff --git a/site/versions/master/docs/install-ubuntu.md b/site/versions/master/docs/install-ubuntu.md
index 86aa9f3..ae36aba 100644
--- a/site/versions/master/docs/install-ubuntu.md
+++ b/site/versions/master/docs/install-ubuntu.md
@@ -15,7 +15,7 @@
 
 *   [Use our custom APT repository (recommended)](#install-on-ubuntu)
 *   [Use the binary installer](#install-with-installer-ubuntu)
-*   [Compile Bazel from source](#install-compile-source.md)
+*   [Compile Bazel from source](install-compile-source.md)
 
 Bazel comes with two completion scripts. After installing Bazel, you can: