Can't install the Ubuntu One Indicator

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http://askubuntu.com – 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. (HowTos)