I wish to be April fool but many of us had hoped it was an April Fool’s prank. But Ubuntu One will, in fact, no longer be available as of June 1, 2014 and all data will be wiped July 31, 2014.

Forget it!!

Open your Terminal using Ctrl + Alt + t and copy and paste it .

sudo apt-add-repository ppa:thefanclub/grive-tools

sudo apt-get update
sudo apt-get install -y grive-tools

Open your Terminal using Ctrl + Alt + t and copy and paste it .

wget https://www.dropbox.com/download?dl=packages/dropbox.py

sudo chmod +x dropbox.py

./dropbox.py

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See download and installation guide

https://www.dropbox.com/install

Go to the download page and choose your OS version and install in your machine .

http://blog.4shared.com/4shared-desktop-is-now-available-for-mac-and-linux-users/