typo correction, removed unneeded apt-get command

util/install/vagrant.sh

@@ -11,7 +11,7 @@
 ## Sanity check
 ##
 if [[ ! "$(lsb_release -d | cut -f2)" =~ $'Ubuntu 12.04' ]]; then
-   echo "This script is only know to work on Ubuntu 12.04, exiting...";
+   echo "This script is only known to work on Ubuntu 12.04, exiting...";
    exit;
 fi
 
@@ -20,7 +20,6 @@ fi
 ##
 sudo apt-get install -y python-pip python-apt git-core build-essential python-dev libxml2-dev libxslt-dev curl
 sudo apt-get install -y software-properties-common python-software-properties
-sudo apt-get install -y python-pip python-dev build-essential
 wget https://bitbucket.org/pypa/setuptools/raw/0.8/ez_setup.py -O - | sudo python
 sudo pip install --upgrade pip
 sudo pip install --upgrade virtualenv