This post is more for my benefit than any ones but you may learn.
The first thing I learnt was that the Ubuntu install will transfer or keep the home folder of the previous version that you are replacing.
The second thing that I found was after I tried to open a pdf that I had transferred to my laptop using kdekennet had some issues. It appears that the transfer messed up the file somewhere along the line which basically made it unreadable.
Dealing with the first, I kept that snippet of information ready for Kubuntu 15.10 to rear its head. When it came to the time to upgrade I started of with a system upgrade but this went wrong, badly. All was going well until the install stopped…no obvious reason. I did some checking and a reboot, I found that the system had a kernel panic and the way I could get to my stuff was to select an earlier kernel and boot up as normal. Yes, I should have backed up before but I was not paying attention and went head long into the update like a crazed maniac. Don’t do this, think before you do something important. In the end I downloaded the new release and totally reinstalled the system, I made the choice of not having a separate home partition for the simple reason that I have decide that I don’t really need to. i have instead decided to get a second external harddrive and keep my photos and music and that and have it permanently connected. Back up will be the drive I have now and hopefully in the near future a home server that is not connected to the outside web.
With the second issue, I found the solution to transferring PDF to android devices to be easier with Airdroid which I think I have mentioned before. This solution though, does not work very easy at all when transferring music. To do this it is best to connect the phone via a usb cable. I am sure that the PDF transfer was affected when I sent it to the laptop via the bluetooth connection. The KDE connect thing though is really useful for control music and using the phone as a touch pad thingy and does work well for transferring photographs