I am installing Ubuntu 12.04 LTS on a Dell Latitude D620 laptop, using a USB stick. What I can see during the installation is that it is downloading packages from the internet, including language packs. I go ahead and click that 'skip' button then restart. But there comes a system error after I log in, plus I can't open 'additional drivers'.
The error's not gone until an 'sudo apt-get update'+'sudo apt-get upgrade'+'sudo apt-get dist-upgrade', and after that I can open 'additional drivers' to install nVidia drivers.
So my question is, is it a must to download and install all packages during installation? If it is, why does Ubuntu provide a button 'skip'?