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To install Lockdown Editor in Ubuntu, run the following command in a terminal:
sudo apt-get install pessulus
Once you've installed the software, you'll need to run as an administrator user and apply the changes to another account on the machine.
Once the installation is complete you can launch it from System > Administration > Lockdown Editor. Now there are some categories which lets you lock down the system options, under General category you can apply general rules like you can disable command line interface, printing and save to disk. Please note that you should apply these rules by logging in as main admin user of the system, and thus these rules will apply to all other users.
[via lifehacker & addictive tips]