I upgraded to Ubuntu 7.1 today. It went very well. It was a large download but otherwise no problems at all. Simple download, upgraded Ubuntu and lots of supported applications. And it removed some no longer supported applications. It is a wonderful free operating system based on Linux for the desktop and very good for non-IT geeks. It automatically notifies you of updates and installs the updates with no need to reboot most of the time. Also it is Linux based and therefore very secure.
I did have one problem with Ubuntu last week. I could not download the photos from my digital camera. I tried various thing but couldn't figure it out. My friend was able to figure out there was a limitation in the software I was using that failed with over something like 1,000 photos (I had 1,085 photos from my trip). We tried another photos software but it failed too. I was able to delete some (that I got off the camera using a Windows computer at work) and then it worked fine.