It seems duplicate but really it's not, I'm really tired of testing all solutions and reaching no success. even I'm thinking about going back to windows because I had several problems with Ubuntu 12.04 .
When I type
sudo apt-get update
0% [Waiting for headers]
appear and stick at this percent and sometimes it goes up to 15 or 30 or ...
I change my server from sources.list and also I chose best server from update manager and even pick software update's checkbox tick but eventually no change to my problem.
Do you have any idea to fix it? I can't wait anymore. thanks in advance