Problem Installing Updates using GUI

[m654321]

When I click on 'Install Updates' in the Menu I get the following error message: 'couldn't fetch the package cache information lists'
Is there a way of fixing this?

When the above happens (which is always at the moment) I use the terminal instead and type:

Code:

sudo apt-get update
sudo apt-get upgrade

Is that sufficient, or do I need to have the command 'install' somewhere in that code?

Thanks for your help
Mike