diff --git a/lessons/0/exercise.ipynb b/lessons/0/exercise.ipynb
index b088895..2eb0f93 100644
--- a/lessons/0/exercise.ipynb
+++ b/lessons/0/exercise.ipynb
@@ -1,25 +1,28 @@
 {
- "cells": [
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "# Exercise 0: Total rows"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": []
-  }
- ],
- "metadata": {
-  "language_info": {
-   "name": "python"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 2
+    "cells": [
+        {
+            "cell_type": "markdown",
+            "metadata": {},
+            "source": ["# Exercise 0: Total rows"]
+        },
+        {
+            "cell_type": "code",
+            "execution_count": null,
+            "metadata": {},
+            "outputs": [],
+            "source": []
+        }
+    ],
+    "metadata": {
+        "kernelspec": {
+            "display_name": "Bash",
+            "language": "bash",
+            "name": "bash"
+        },
+        "language_info": {
+            "name": "bash"
+        }
+    },
+    "nbformat": 4,
+    "nbformat_minor": 2
 }
diff --git a/postBuild b/postBuild
index b3d25a5..fc6b180 100644
--- a/postBuild
+++ b/postBuild
@@ -2,5 +2,4 @@
 
 set -ex
 
-pip install -e ./bash_kernel
 python -m bash_kernel.install
\ No newline at end of file
diff --git a/start b/start
index 7055093..df954e0 100644
--- a/start
+++ b/start
@@ -1,6 +1,5 @@
 #!/bin/bash
 
-jupyter kernelspec remove python3
 python -m bash_kernel.install
 export PATH=$HOME/path_files:$PATH