diff --git a/.travis.yml b/.travis.yml
index 6d5d476a..fe0d472b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,18 @@
 language: python
+
 python:
     - "3.4"
     - "3.5"
+
+virtualenv:
+    system_site_packages: true
+
+before_install:
+    - ./bootstrap-debian.sh
+
 install:
-    - ./install.py --target=virtualenv
+    - ./install.py
     - ./install.py --uninstall=virtualenv
+
 script:
-    - ./install.py --target=system --checks --tests
+    - ./install.py --checks --tests
diff --git a/README.rst b/README.rst
index 4a25d243..60fb12e9 100644
--- a/README.rst
+++ b/README.rst
@@ -4,4 +4,24 @@ Guake 3 README
 Setting up a developer's environment
 ------------------------------------
 
+On Ubuntu and Debian, use
+
+    ./bootstrap-debian.sh
+
+Install virtualenv with:
     ./install.py
+
+Setting up to your system
+-------------------------
+
+    ./install.py --target=system
+
+Note: not supported yet. Installing on your system directly is a **wrong** idea. It should always be
+installed in a proper virtualenv, to avoid messing with your system modules. Of course, Guake relies
+on VTE and GTK modules that shall come from your system, but there is no reason to let Guake
+override any python package of your system.
+
+When Guake is packaged in a distribution (Ubuntu, Debian, Fedora,...), in this case only it makes
+sense to install it outside of a virtualenv.
+However, please see:
+    https://hynek.me/articles/python-deployment-anti-patterns/
diff --git a/bootstrap-debian.sh b/bootstrap-debian.sh
new file mode 100755
index 00000000..499cd7c7
--- /dev/null
+++ b/bootstrap-debian.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+sudo apt-get install -q python-dbus python3-dbus python-gi python3-gi
diff --git a/install.py b/install.py
index 1e87ff4a..189796f3 100755
--- a/install.py
+++ b/install.py
@@ -133,6 +133,7 @@ elif options.target == "virtualenv":
     lib.printInfo("VIRTUAL_ENV = %s", os.environ.get("VIRTUAL_ENV"))
 else:
     lib.printInfo("Installation in: {}".format(dest_path))
+    raise NotImplementedError("system deployment not supported yet")
 
 # Todo: check installed packages: python3-gi
 dataFolder = "data"
diff --git a/install_lib.py b/install_lib.py
index c9254228..3da6bab3 100644
--- a/install_lib.py
+++ b/install_lib.py
@@ -75,6 +75,7 @@ class AsciiColor(object):
 
     ENDC = '\033[0m'
 
+
 # Do *not* use color when:
 #  - on windows
 #  - not in a terminal except if we are in Travis CI