I like Ubuntu, except that every one or two years if I don't upgrade to the latest Ubuntu release, many applications will not be updated for my old Ubuntu release. For example, I am using the long term release 12.04, but I notice some applications don't work and update now as well as before, and some new applications that are developed for the latest release using some libraries of new versions aren't easy to install on 12.04.
I am not very comfortable with installing operating systems, and backing up my data, so I am always behind in terms of getting the up-to-date OS release.