diff --git a/week01_intro/crossentropy_method.ipynb b/week01_intro/crossentropy_method.ipynb
index 2e0daf44c..7f3b39d4e 100644
--- a/week01_intro/crossentropy_method.ipynb
+++ b/week01_intro/crossentropy_method.ipynb
@@ -22,7 +22,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week01_intro/deep_crossentropy_method.ipynb b/week01_intro/deep_crossentropy_method.ipynb
index a5c3e1bce..c490ee0ad 100644
--- a/week01_intro/deep_crossentropy_method.ipynb
+++ b/week01_intro/deep_crossentropy_method.ipynb
@@ -25,7 +25,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week01_intro/seminar_gym_interface.ipynb b/week01_intro/seminar_gym_interface.ipynb
index 1ba5d6df2..e38645a75 100644
--- a/week01_intro/seminar_gym_interface.ipynb
+++ b/week01_intro/seminar_gym_interface.ipynb
@@ -18,7 +18,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week03_model_free/homework.ipynb b/week03_model_free/homework.ipynb
index 13c6221a6..23894ae92 100644
--- a/week03_model_free/homework.ipynb
+++ b/week03_model_free/homework.ipynb
@@ -39,7 +39,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1\n",
+    "    os.environ['DISPLAY'] = ':1'\n",
     "\n",
     "import numpy as np\n",
     "import matplotlib.pyplot as plt\n",
@@ -428,7 +428,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1\n",
+    "    os.environ['DISPLAY'] = ':1'\n",
     "\n",
     "%load_ext autoreload\n",
     "%autoreload 2\n",
diff --git a/week03_model_free/seminar_qlearning.ipynb b/week03_model_free/seminar_qlearning.ipynb
index 40201444b..01bb2addf 100644
--- a/week03_model_free/seminar_qlearning.ipynb
+++ b/week03_model_free/seminar_qlearning.ipynb
@@ -26,7 +26,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1\n",
+    "    os.environ['DISPLAY'] = ':1'\n",
     "\n",
     "import numpy as np\n",
     "import matplotlib.pyplot as plt\n",
diff --git a/week04_approx_rl/homework_lasagne.ipynb b/week04_approx_rl/homework_lasagne.ipynb
index f3334f096..916817922 100644
--- a/week04_approx_rl/homework_lasagne.ipynb
+++ b/week04_approx_rl/homework_lasagne.ipynb
@@ -38,7 +38,7 @@
     "\n",
     "    !bash ../xvfb start",
     "\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week04_approx_rl/homework_pytorch_debug.ipynb b/week04_approx_rl/homework_pytorch_debug.ipynb
index f106fc63f..e34bb70d8 100644
--- a/week04_approx_rl/homework_pytorch_debug.ipynb
+++ b/week04_approx_rl/homework_pytorch_debug.ipynb
@@ -53,7 +53,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week04_approx_rl/homework_pytorch_main.ipynb b/week04_approx_rl/homework_pytorch_main.ipynb
index 6bdc0958e..b1562d625 100644
--- a/week04_approx_rl/homework_pytorch_main.ipynb
+++ b/week04_approx_rl/homework_pytorch_main.ipynb
@@ -53,7 +53,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week04_approx_rl/homework_tf.ipynb b/week04_approx_rl/homework_tf.ipynb
index a7b812eeb..1e6b87c80 100644
--- a/week04_approx_rl/homework_tf.ipynb
+++ b/week04_approx_rl/homework_tf.ipynb
@@ -23,7 +23,7 @@
     "\n",
     "    !bash ../xvfb start",
     "\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week04_approx_rl/seminar_lasagne.ipynb b/week04_approx_rl/seminar_lasagne.ipynb
index e7e68c2f5..ad632d0ab 100644
--- a/week04_approx_rl/seminar_lasagne.ipynb
+++ b/week04_approx_rl/seminar_lasagne.ipynb
@@ -30,7 +30,7 @@
     "\n",
     "    !bash ../xvfb start",
     "\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week04_approx_rl/seminar_pytorch.ipynb b/week04_approx_rl/seminar_pytorch.ipynb
index 38b357376..db2142bcb 100644
--- a/week04_approx_rl/seminar_pytorch.ipynb
+++ b/week04_approx_rl/seminar_pytorch.ipynb
@@ -28,7 +28,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week04_approx_rl/seminar_tf.ipynb b/week04_approx_rl/seminar_tf.ipynb
index 837a46053..4ac75b7ca 100644
--- a/week04_approx_rl/seminar_tf.ipynb
+++ b/week04_approx_rl/seminar_tf.ipynb
@@ -26,7 +26,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\"))==0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY=:1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week06_policy_based/a2c-optional.ipynb b/week06_policy_based/a2c-optional.ipynb
index c3cebdd7d..c31029ae3 100644
--- a/week06_policy_based/a2c-optional.ipynb
+++ b/week06_policy_based/a2c-optional.ipynb
@@ -23,7 +23,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week06_policy_based/reinforce_lasagne.ipynb b/week06_policy_based/reinforce_lasagne.ipynb
index a49aa29ee..d0dad65a1 100644
--- a/week06_policy_based/reinforce_lasagne.ipynb
+++ b/week06_policy_based/reinforce_lasagne.ipynb
@@ -40,7 +40,7 @@
     "\n",
     "    !bash ../xvfb start",
     "\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week06_policy_based/reinforce_pytorch.ipynb b/week06_policy_based/reinforce_pytorch.ipynb
index c2c9660cc..e705b86ff 100644
--- a/week06_policy_based/reinforce_pytorch.ipynb
+++ b/week06_policy_based/reinforce_pytorch.ipynb
@@ -34,7 +34,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week06_policy_based/reinforce_tensorflow.ipynb b/week06_policy_based/reinforce_tensorflow.ipynb
index 0578857cf..c46aaaacf 100644
--- a/week06_policy_based/reinforce_tensorflow.ipynb
+++ b/week06_policy_based/reinforce_tensorflow.ipynb
@@ -19,11 +19,10 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "%env THEANO_FLAGS = 'floatX=float32'\n",
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week08_pomdp/practice_pytorch.ipynb b/week08_pomdp/practice_pytorch.ipynb
index 4e390f9a0..3aa2ed99d 100644
--- a/week08_pomdp/practice_pytorch.ipynb
+++ b/week08_pomdp/practice_pytorch.ipynb
@@ -21,7 +21,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week08_pomdp/practice_tensorflow.ipynb b/week08_pomdp/practice_tensorflow.ipynb
index d7e9a6839..198e71162 100644
--- a/week08_pomdp/practice_tensorflow.ipynb
+++ b/week08_pomdp/practice_tensorflow.ipynb
@@ -36,7 +36,7 @@
     "\n",
     "    !bash ../xvfb start",
     "\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week08_pomdp/practice_theano.ipynb b/week08_pomdp/practice_theano.ipynb
index 85a5c88e4..21cae474f 100644
--- a/week08_pomdp/practice_theano.ipynb
+++ b/week08_pomdp/practice_theano.ipynb
@@ -25,7 +25,7 @@
     "\n",
     "    !bash ../xvfb start",
     "\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week09_policy_II/ppo.ipynb b/week09_policy_II/ppo.ipynb
index 85194e1c6..396e678cf 100644
--- a/week09_policy_II/ppo.ipynb
+++ b/week09_policy_II/ppo.ipynb
@@ -27,7 +27,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week09_policy_II/seminar_TRPO_pytorch.ipynb b/week09_policy_II/seminar_TRPO_pytorch.ipynb
index d97e74301..d241a3fbb 100644
--- a/week09_policy_II/seminar_TRPO_pytorch.ipynb
+++ b/week09_policy_II/seminar_TRPO_pytorch.ipynb
@@ -19,7 +19,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week09_policy_II/seminar_TRPO_tensorflow.ipynb b/week09_policy_II/seminar_TRPO_tensorflow.ipynb
index 1084b55ad..c13af6562 100644
--- a/week09_policy_II/seminar_TRPO_tensorflow.ipynb
+++ b/week09_policy_II/seminar_TRPO_tensorflow.ipynb
@@ -10,7 +10,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week09_policy_II/seminar_TRPO_theano.ipynb b/week09_policy_II/seminar_TRPO_theano.ipynb
index d8e03a73f..a7cc23348 100644
--- a/week09_policy_II/seminar_TRPO_theano.ipynb
+++ b/week09_policy_II/seminar_TRPO_theano.ipynb
@@ -10,7 +10,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1"
+    "    os.environ['DISPLAY'] = ':1'"
    ]
   },
   {
diff --git a/week10_planning/seminar_MCTS.ipynb b/week10_planning/seminar_MCTS.ipynb
index c8b6e2fa2..28dffc41e 100644
--- a/week10_planning/seminar_MCTS.ipynb
+++ b/week10_planning/seminar_MCTS.ipynb
@@ -15,7 +15,7 @@
     "import os\n",
     "if type(os.environ.get(\"DISPLAY\")) is not str or len(os.environ.get(\"DISPLAY\")) == 0:\n",
     "    !bash ../xvfb start\n",
-    "    %env DISPLAY = : 1\n",
+    "    os.environ['DISPLAY'] = ':1'\n",
     "\n",
     "import numpy as np\n",
     "import matplotlib.pyplot as plt\n",