I am using Ubuntu 11.10 Oneric Ocelot. In it WiFi gets idle after some time. To get connection back I have to disconnect and reconnect. So I chose to upgrade 12.04 LTS Precise Pangolin. But the issues I am not able to complete the download. WiFi become idle after it downloads 20 or something files (out of 2,000) and I have restart PC to get the connection. I am downloading the iso in Windows. Can I upgrade from ISO without loosing my settings ? If yes, please tell me how. Thanks in advance.
Yes, for sure you can using the 12.10 LiveCD/LiveUSB.
As for upgrading to 12.04 LTS, why not just upgrade to 12.10 or even 13.04? I'm not sure as to whether-or not the 12.04 CD has the option like 12.10 onwards.