You can install or upgrade to Xfce 4.10 easily in xubuntu 12.04 by simply adding the repository and installing it.
Open up the “Terminal” and enter the following commands:
$ sudo add-apt-repository ppa:xubuntu-dev/xfce-4.10
$ sudo apt-get update
$ sudo apt-get dist-update
If you have any sort of queries on regarding this installation, just leave a comment and will get right back at you. Don’t forget to follow my blog to get future updates!