Ubuntu One indicator is not included officially when install ubuntu one in ubuntu. But an unofficial Ubuntu One indicator is available, and it works great. It was updated just recently, and missing options like links to open the Ubuntu One folder, Ubuntu One website, and the control panel were added. It also displays the ETA in the drop-down menu now. The indicator was completely rewritten, this time in the Vala programming language, to make it much more memory-efficient.
How to Install Ubuntu One Indicator for Ubuntu 11.04/11.10/12.04
sudo add-apt-repository ppa:rye/ubuntuone-extras sudo apt-get update sudo apt-get install indicator-ubuntuone
Ubuntu One indicator add itself automatically to your Startup Applications, so you don’t need to care about that bit. Just logout then re-login Ubuntu One indicator to start displaying in the top panel.