Here is one from many ways to ‘bypass’ your current proxy
(for example in my university)
I used privoxy with my ubuntu gutsy . .
1. First what we have to do :
$ sudo apt-get install privoxy
2. Now open your privoxy configuration:
$ sudo gedit /etc/privoxy/config
3. Add the following line :
forward-socks4a / localhost:9050 .
don’t forget the last dot . .:)
4. Finally, reboot and setting your browser with localhost:8118
happy anonymous browsing . . 🙂