I have YouTube banned in my system. How can I enable it?
I tried to lookup for it in
/etc/hosts.deny file but couldn't locate it.
Looking for an Ubuntu specific solution, how to disable/enable it?
hosts.deny helps or not?
I'm not sure that this is the right place to ask that question, since it's got nothing to do with Ubuntu (or any specific OS for that matter), BUT... Since it's already there, I might as well answer you :)
A note first: Before anyone thinks that it is 'not right' to try to circumvent a rule like this, there can actually exist a number of situations when there is no other way to access somethings that are otherwise completely legal and allowed and there's nothing wrong in doing so or trying to do so. I myself have had an awful opportunity to live in a place where so many convenient websites are blocked on a country level (I'm talking about Skype and Flickr and things like that, completely harmless). Also, rational people should not be approving any kind of restrictions, and grown-ups need to be responsible for their own actions.
Depending on the method used to block the content, there might be one or more methods (or none :) ) that you can use. The first thing that I'd suggest is trying to use a proxy server. You can do it in several ways. The best place to start would be Hide My Ass. There you can:
You can also find many useful instructions on that website.
A second solution is to use Tor project and its Vidalia tool. Basically, it's a shared connection tool. You have several options there too.
There is some great documentation on Vidalia's website, but if you're having trouble with it, feel free to leave a comment here.
Another possible solution that I just remembered might help you is to download and install Opera desktop browser. When you open Opera, enable its Opera Turbo feature. Opera Turbo is a traffic compression tool by Opera, but by nature it uses Opera's proxy servers. That might be handy.
Finally, also in Opera, you have a feature to browse internet in a 'Private tab'. I'm really not sure if that will help, but it's worth mentioning. I also have no idea if any other browser has this feature. To enable private browsing in Opera, click on Opera button > Tabs and Windows > New private tab, and browse away :)