Multi-threaded apt-get howto

1. start synaptic package manager
2. select the package to be install
3. goto File > Package download script
4. cat package_download_script.sh | sed s/wget/'proz -k=10'/ > package_download_script_proz.sh
5. goto /var/cache/apt/archive/
6. execute the script here
6. run apt-get install

that's it