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I am trying to upgrade to 14.04.1 LTS. It is showing:

You have to download a total of 137 k. This download will take about 
4 seconds with your connection. 

Installing the upgrade can take several hours. Once the download has 
finished, the process cannot be canceled. 

Continue [yN]  Details [d]d
Continue [yN]  Details [d]y

Fetched 0 B in 0s (0 B/s)                                                                                                                    

Could not download the upgrades 

The upgrade has aborted. Please check your Internet connection or 
installation media and try again. All files downloaded so far have 
been kept. 

Failed to fetch 
403 Forbidden 

Restoring original system state

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You didn't state which command you are running for upgrading. Anyway, you could try to do the upgrade from the 14.04 live cd, it should work without problems. – Andrea Lazzarotto Aug 17 '14 at 14:51
try to upgrade using different server. – g_p Aug 17 '14 at 15:06
I'm using "do-release-upgrade" to upgrade .. everything went fine but at last it shows 403 forbidden .. and upgrade is aborted ... – Rahul Kumar Aug 17 '14 at 15:22

First of all, I think it's better to disable all third-party repositories, if you have. Next you have to update your system with:

sudo apt-get update && sudo apt-get upgrade && sudo apt-get dist-upgrade

Then you have to run Update Manager through terminal to upgrade to 14.04. Open a terminal and write this:

update-manager -d

And you are ready to upgrade your distro to 14.04 ...!!!

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