The base VM of Helpdesk Pilot currently has the Ubuntu 10.04 OS. Since this is not a supported a release, the URLs in the sources file needs to be changed to do basic operations like apt-get update. 

When you see errors like this, 

Please do the following steps to change the URLs:

1. vi /etc/apt/sources.list
2. Type : followed by %s/us.archive/old-releases/g and press Enter. This will change all references of us.archive in the file to old-releases. Thereby changing the URLs to http://old-releases.ubuntu.com
3. Next, type : followed by %s/security.ubuntu/old-releases.ubuntu/g and press Enter. This will change all references of security.ubuntu in the file to old-releases.ubuntu. Thereby changing the URLs to http://old-releases.ubuntu.com
4. Type : followed by wq and press Enter to save the changes

You can the proceed with the installation steps as mentioned here.