Docs stub for Unbuntu, restore executable flag on binaries.

doc-src/install.html

@@ -50,3 +50,22 @@ image/*; /usr/bin/open -Wn %s
 video/*; /usr/bin/open -Wn %s
 </pre>
 
+
+## Ubuntu
+
+On Ubuntu, you will need the following native packages to install mitmproxy
+from source:
+
+- build-essential
+- python-dev
+- libffi-dev
+- libssl-dev
+- libxml2-dev
+- libxslt1-dev
+
+
+
+
+
+
+