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sudo apt-get install indicator-ubuntuone
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package indicator-ubuntuone is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'indicator-ubuntuone' has no installation candidate

I even tried 'ubuntuone-indicator', but that also didn't work.

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You have to add Third-Party Repository for installing UbuntuOne-Indicator, by following these commands

sudo add-apt-repository ppa:rye/ubuntuone-extras
sudo apt-get update && sudo apt-get install indicator-ubuntuone

Logout and login to see the Indicator.

EDIT : If you have already added the Repository then try changing your mirror from software sources (refer image) and do sudo apt-get update && sudo apt-get upgrade in terminal , then try installing again

enter image description here

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I've done already all of this. Sorry if I had not included the sudo add-apt-repository in my example. – tonybac Jul 20 '12 at 12:56
@tonybac -Try changing your mirror from software sources and do sudo apt-get update && sudo apt-get upgrade in terminal , then try installing again. – atenz Jul 20 '12 at 12:59
It worked. I checked my software sources and found out that the rye ppa was unchecked. I had the ubuntu one indicator working before, but after uninstalling both the Ubuntu One app and the indicator, I also unchecked its ppa from my software sources. – tonybac Jul 20 '12 at 17:25
Fine :) , you provided incomplete info in question then , anyways it is now sorted out, HA :D – atenz Jul 20 '12 at 17:31
this is not valid anymore under raring – Papachan May 31 '13 at 15:07

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