I am relatively new to Linux, so can you indicate the exact commands (step-by-step) that I need to type to get the latest QGIS installed on Ubuntu 14.04.

I have tried to follow the instructions provided here https://www.qgis.org/en/site/forusers/alldownloads.html but I haven't managed to install anything.

Can someone explain to me step by step process of doing it. Right from adding the QGIS repository on the sources list.

I have Ubuntu 14.04.1 LTS installed on a 32-bit Dell Latitude E4310 Machine