This question might not be directly related to problems in Ubuntu, but I am still posting this here because it is possible that someone might know of a solution.
I am using Ubuntu 12.04 and am using a Belkin N150 wireless router to connect to the Internet. It seems that there is a problem with using Belkin N150 wireless routers. The Internet connection is very flaky, and the connection drops frequently for a few minutes before it is again re-established.
I found the following link that discusses how to solve this problem on other non-Linux platforms.
http://www.wurwaldesign.com/blog/2011/03/belkin-n150-router-slow-solutions-for-complete-beginners/
It would help if anyone can suggest ways to solve this issue on Ubuntu.
Best Answer
This may not be a solution to the problem but it's a work around if you have an Android phone (depends on the model and carrier restrictions too).
I bought a Belkin N150 Wireless USB Adapter. It worked great for Windows 7 but when I installed Ubuntu although it paired well, I didn't get good signal and would disconnect most of the times. Belkin has driver for Mac And Windows but not for Ubuntu. I needed the Internet badly (my router is in living room and my study room is far from living room and I was lazy to shop for a compatible new wireless adapter).
It struck to me that Android phones have tethering option. I plugged my phone (Google Nexus)(it works with S3 too) to the Ubuntu System and Turned on the USB tethering option and viola I got a great wired signal and was able to browse and download stuff again from Ubuntu m/c.
That solved my problem temporarily (until I find a right driver or new wireless adapter that works for Ubuntu). Forgot to mention that my phone is connected using WI-FI (also works with 3G).