Read the page you linked to carefully.
Code:
$ sudo sh -c 'echo "deb http://packages.linuxdeepin.com/deepin trusty main non-free universe" >> /etc/apt/sources.list'
$ sudo sh -c 'echo "deb-src http://packages.linuxdeepin.com/deepin trusty main non-free universe" >> /etc/apt/sources.list'
It clearly says under these instructions on that page that you should change the release name to the one you're using, in your case, replace all instances of 'trusty' with 'xenial' and see how you go. If you get it installed, log out, choose the Deepin session from the session menu at the login screen, then log in. You should then be in the Deepin DE and will be whenever you boot until you change it back the same way.
14.04 LTS is fully supported until 2019 so it is older rather than old.
PS: You may not want to run this last line:
Code:
sudo apt-get install python-deepin-gsettings deepin-music-player deepin-software-center deepin-movie deepin-game-center
That will install Deepin apps and software centre. You already have a music player and software centre. Don't know about the others. The first one, python-deepin-settings, might be required, but not the rest.
PPS: In 16.04, you only need 'sudo apt install' rather than 'sudo apt-get install', although either will work.
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