Following Cheiron's comments, I also was able to resolve the issue by installing the packages ubuntuone-client and ubuntuone-client-tools. As a side note, I am using FireFox 3.5 therefore I'm not sure if the apt:url didn't install because of this...
Following Cheiron's comments, I also was able to resolve the issue by installing the packages ubuntuone-client and ubuntuone- client- tools. As a side note, I am using FireFox 3.5 therefore I'm not sure if the apt:url didn't install because of this...