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How to install QGIS on Ubuntu 12.04?

Title says it all, and if so, how do I go about getting it? I currently have 1.7 Wroclaw installed via the Ubuntu Software Center, but I need the more advanced Field Calculator of 1.8.

I am using Ubuntu out of necessity because the Windows version has a bug preventing large raster images being exported. I'm unfamiliar with all the ridiculous hoop-jumping and command typing seemingly required to simply install software in Ubuntu, so answer as if to a complete idiot and you won't be far off the truth!


Execute the following commands in a terminal

sudo apt-get install add-apt-repository
sudo add-apt-repository ppa:ubuntugis/ubuntugis-unstable
sudo apt-get update
sudo apt-get install qgis

However i would recommend to use the official QGIS sources. More information here

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