how do i reinstall Ubuntu?

[PsykoSonic]

I recently ran into some problems with Ubuntu and need to reinstall it, all the web pages ive looked on are quite outdated so I was wondering how I go about it and im a still able to keep the partitions I used or will that be totally wiped too? I really don't know.

[upset]

Didn't you post something about this already? and just youtube/google it