I am very new to Ubuntu (like yesterday!) and decided to run a dual boot of Ubuntu using the Windows installer. After some initial problems, it was installed successfully.
However, I am only connected to the internet for about two minutes time consecutively, as the WiFi connection seems to become dead then. Other devices on the same WiFi network can access the internet just fine at that time. When I'm using Windows 8 on the exact same machine, I'm also not experiencing this issue.
The internet connection on Ubuntu works for just a few minutes allowing me to open one or two web pages or to find a program in the software centre and it will then completely drop out, while the network indicator still says it's connected.
I can work around the problem a little bit by disconnecting to the WiFi manually, then reconnecting again. Yet, that only works for the same time as it will happen again after a few minutes.
The machine is a Toshiba Satelitte C850.
I would appreciate some help taking my inexperience with Ubuntu into account.
update: Ok i installed ubuntu 12.10 on a Toshiba Satellite C850 with an Intel i5-3210M and 64bit system using windows installer. Plugging in using an ethernet cable makes no difference.