Failed to download Ubuntu One

Question

I am trying to install Ubuntu One but here showing an error message.

I've no idea what does it mean and how to handle it. Anybody please help me.

Answer 1

That means you have wrong line inside your sources.list or sources.list.d files. Your VirtualBox is non-free version so it does not have sources shipped with it.

To fix error

Search for

deb-src http://download.virtualbox.org/virtualbox/debian maverick contrib

inside /etc/apt/sources.list and comment it by # sign.

Alternate way

Look into Software & Sources in Configuration. Show Additional tab and uncheck sources for VirtualBox. Here is the screenshot:
Notice that VistualBox sources are unchecked.

After all

Run

sudo apt-get update

and this will fix the error.