I did the recommended upgrade to 13.10, and it caused a large number of graphical glitches on my machine. I attempted to do a re-install using a live USB, and it failed because I "held broken packages". I then did a clean 13.10 install instead, and now I'm getting bombarded with errors at boot. Also, shutting down the computer causes an immediate reboot after it powers totally down. This is very annoying, and I'd like to get my system to run as well as when I bought it.