I am not very familiar with all the process of installing Ubuntu and the how-it-works, but one of my friends had shown me how to install Ubuntu 10.something on a partition (I have Windows 7 on the other one) and it worked nicely, and since then I've been using Ubuntu. The upgrade from 10 to 11 went just fine, but when going from 11 to 12.04, my computer crashed in the middle (I don't remember why). But now I have Ubuntu 12.04 and I constantly have this red disk with a white dash in it on my desktop bar reminding me that I have a System Problem. I believe re-installing Ubuntu 12.04 (if my computer doesn't crash during the installation this time) would work, but I don't know how to do this. So here is the question :
How would I re-install Ubuntu 12.04? Is there a guide out there for this?