If after the provisioning of a debian openvz vps the apt-get update is slow to download updates
edit /etc/apt/sources.list
and replace the content with the following:
deb http://mi.mirror.garr.it/mirrors/debian/ squeeze main
deb-src http://mi.mirror.garr.it/mirrors/debian/ squeeze main
deb http://security.debian.org/ squeeze/updates main
deb-src http://security.debian.org/ squeeze/updates main
then run
apt-get update
apt-get upgrade
