Ubuntu 12.04 unable to install through software centre

Hi I have installed Ubuntu 12.04 LTS and updated using a mobile broadband. But whenever I use another wireless network to do this it does not help. I can download .deb file and install through ubuntu software centre while using the wireless network. But I cannot install through the ubuntu software centre directly. What to do? Please help me...

It's kind of confusing
But I suggest

Code:

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sudo apt-get install synaptic

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From now on use synaptic to install software

But synaptic also not working!

Quote:

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Originally Posted by kuchakra

But synaptic also not working!

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If you can open it
Is it reporting broken packages?

Hey,

When you try to install any software via terminal (sudo apt-get install), do you encounter any kind of error message?

Quote:

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Originally Posted by kuchakra

But synaptic also not working!

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why dont you post the errors here.

It will be helpful. :)

I have changed the network proxy settings and it is working... thanks a lot :-)