As Google Reader will shutdown in the 1st of July, we need an alternative. The social news site Digg wants to take advantage of Google Reader’s shutdown and builds a Reader. 
But for now, the closest to Google Reader is Feedly. There are many users that migrated from Google Reader to Feedly, since Google announced that it closes the reader. Feedly has almose the same keyboard shortcuts as Google Reader and offers support for Android and iOS, so it could become the best feedreader alternative. Also, importing your Google subscriptions to Feedly is available.
For now, Feedly is free but the company is planning on offering premium services with advanced features, for users who pay a monthly / anual subscription.
Unity-webapps-feedly will add your Feedly feeds in the Ubuntu Messaging Menu:
How to Install Unity Webapp Feedly On Ubuntu 13.10 Saucy Salamander, Ubuntu 13.04 Raring Ringtail, Ubuntu 12.10 Quantal Quetzal, Ubuntu 12.04 Precise Pangolin, Linux Mint 15 Olivia, Linux Mint 14 Nadia and Linux Mint 13 Maya:
To install Unity-webapps-feedly, just add the ppa, update the local repositories and install the app:
$ sudo add-apt-repository ppa:unity-webapps-feedly/stable
$ sudo apt-get update
$ sudo apt-get install unity-webapps-feedly