$ sudo apt-get update
$ sudo apt-get install desktopcouch-ubuntuone 

desktopcouch-ubuntuone is installed in your system.

Make ensure the desktopcouch-ubuntuone package were installed using the commands given below,

$ sudo dpkg-query -l | grep desktopcouch-ubuntuone *

You will get with desktopcouch-ubuntuone package name, version, architecture and description in a table

desktopcouch-ubuntuone package basic information: