I am not able to download Ubuntu One App on Samsung Note II - neither via App Store nor via Bar Code. Could the app be made to appear on the screen of the device?
The Bar Code will most likely link you to the Google Play market. A quick google search yielded this download link (not verified). Make sure you can install apps off market by clicking on the binary installer (
It's better if you can install it from the market because you'd get automatic updates, but if it ain't broke, no need to fix it, right? At least Android gives you the option to install apps off market. If it's not enabled, when you try to install an APK binary, the prompt will take you to the settings where you can toggle this.