<div dir="ltr">If you are interested in using a Linux OS, and are just having trouble getting started then you can visit<div><a href="http://live.osgeo.org/en/download.html">http://live.osgeo.org/en/download.html</a> which is a preconfigured Xubuntu with many open gis applications all ready pre-installed, including the ones you just mentioned.<br>
</div><div><br></div><div>Ive used it myself with much success, especially when you just dont feel like jumping through the install hoops.</div><div><br></div><div>This tutorial also provides its own .vdi to install into VirtualBox with pre-installed software. Ive used this one a little less but so far it seems good as well. <a href="http://globalmonitoring.sdstate.edu/projects/weld/weldtraining.html">http://globalmonitoring.sdstate.edu/projects/weld/weldtraining.html</a> --though it only has grass and qgis installed, no postgres/postgis or mapnik.</div>
<div><br></div><div>Garret</div></div>