CC-2889: Virtualenv fails when installing through apt repo on Ubuntu Server 10.04

-added sync commands

install_minimal/airtime-install

@@ -7,6 +7,11 @@ if [ `whoami` != 'root' ]; then
     exit 1
 fi
 
+#Sync to force flushing all buffered writes to the disk. We need to do this because
+#sometimes packages that have been installed by a script before this one are
+#not yet available to call.
+sync
+
 set +e
 DEB=$(dpkg -s airtime 2> /dev/null | grep Status)
 set -e
@@ -59,6 +64,9 @@ else
     echo -e "\n*** Existing Airtime Virtualenv Found ***"
 fi 
 
+#Another sync to flush buffered writes to disk.
+sync
+
 virtualenv_bin="/usr/lib/airtime/airtime_virtualenv/bin/"
 . ${virtualenv_bin}activate