Need Help! I recently installed ubuntu 12.04.1 on a thumb drive. All in all the OS run good but when i unplugged my local network connection and tried to connect my laptop to a wireless router it has a very poor bandwidth, cannot download files because it only speeds up to 30kbps but when i try to put back my connection to local network connection my download speed speeds up to 250kbps.

I also tried downloading to an Windows with another laptop, it seems fine.

Im a newbie about ubuntu. Please Help me.

Sorry for my bad english.