disable security

Author: tgebru

assignment2_google_cloud.md

@@ -60,6 +60,14 @@ Instead of selecting an entry in **OS images** for **Boot disk**, select **Custo
 It should take about 5 minutes for the instance to get created. You should now be able to launch your instance with our custom image. The custom disk is 40GB and uses Ubuntu 16.04 LTS. 
 The default python version in the system is Python 2.7.2 and there is a virtual environment in **/home/cs231n/myVE35** with version 3.5.2. 
 
+**NOTE:** Some students have reported GPU instances whose drivers disappear upon restarts. And there is strong evidence to suggest that the issue happens when Ubuntu auto-installs security updates upon booting up. The easiest way to disable auto-updating is to run
+
+```
+sudo apt-get remove unattended-upgrades
+```
+
+after logging into your instance for the first time.
+
 ### Load the virtual environment ###
 You **don't need to create a new virtual environment** for this assignment -- we are providing you with one, with all the Python packages you need for the assignment already installed. So, unlike the previous assignment, you do not need to run any commands to create the virtual environment (and install packages, etc), just one command to activate it. To use this virtual environment, run the following command (you may have to do this every time you start your instance up, if you don't see your bash prompt prefaced by "(myVE35)"):