Arkose can serve to make sandboxing easy on Ubuntu Linux. It uses LXC as technology to isolate programs that you don't trust fully.
On Natty 11.04 the installation is as simple as
sudo apt-get install arkose
Check the links below for more information.
- The developer's blog: http://www.stgraber.org/2011/01/09/sandbox-changes-name-to-become-arkose/
- The Arkose source code can be found on: https://launchpad.net/arkose
- German Wiki Article on Arkose: http://wiki.ubuntuusers.de/Arkose
- Alternative on Fedora: virt-sandbox (see here)