Zero Install is a decentralized installation system (there is no central repository; all packages are identified by URLs), loosly-coupled (if different programs require different versions of a library then both versions are installed in parallel, without conflicts), and has an emphasis on security (all package descriptions are GPG-signed, and contain cryptographic hashes of the contents of each version). Each version of each program is stored in its own sub-directory within the Zero Install cache (nothing is installed to directories outside of the cache, such as /usr/bin) and no code from the package is run during install or uninstall. The system can automatically check for updates when software is run.
Install Zero Install Injector in ubuntu
sudo apt-get install zeroinstall-injector
This will install all the required files