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I get distracted easily and need something like this.

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Absolutely! Try Self-Control, a great application for blocking certain websites and applications for a set period of time.

Self-Control Screenshot

The best thing about this application is that once you've started it, you can't have a moment of weakness and reverse your decision. Even if you restart your computer, uninstall the application and delete all its files, you will still have to wait until that timer runs out before you can go on Facebook or AskUbuntu again ;).

(It's worth noting that there IS a way to turn it off in case of EMERGENCIES ONLY, but I won't tell you it here as that defeats the purpose of the app)

Image and source from:

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Why not edit /etc/hosts and add an entry pointing your offending websites to your localhost?

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Like for all operating systems just beware of installing applications from unofficial sources (PPAs). In 11.04 Ubuntu Software Centre you may use starred rating in order to evaluate quality of software you are planning to install to.

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I don't think OP meant that. OP does not have discipline and needs an application that locks the system to allow him to do his work without opening non-related websites or applications (games). – Lekensteyn May 13 '11 at 21:22
I think Ubuntu Software Centre has exactly this function :) (description and rating of software) – Vincenzo May 13 '11 at 21:30
Rating is still done by users, which make it not foolproof. Take WOT for example, most users will be honest but there are still some people deliberately downvoting some websites, like their schools websites. In your spare time, you're free to use any application you want (like games), but when you've to study or work, those applications are still accessible. – Lekensteyn May 13 '11 at 21:34
Agree with you statement. So there is only way to impose installation of any software without system/network administrator's permission :) – Vincenzo May 13 '11 at 21:46
I think the OP was talking about being easily distracted and not being able to focus, and needing something that will block distracting programs and websites (such as games) to help with this. So the problem isn't with installing programs, it's to prevent the OP from accessing distracting programs and websites when he/she needs to concentrate. – Mandy May 13 '11 at 23:55

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