A few things (ie my 2c worth): Firstly upgrading from 11.04 to 11.10 is not a 'minor upgrade'. An Ubuntu upgrade replaces pretty much every single package on your computer! So it hardy counts as a minor upgrade. Although in some respects less radical than changing from one version of Windows to another, it's still a pretty major thing. Secondly, personally I don't like doing in place upgrades (like you've done). I much prefer to do a clean install. In my experience they're much more successful and much less prone to 'glitchy' problems, like you're reporting. This is nothing new, in fact they have got better over time, but I still prefer a clean install. I haven't used 11.10 but I strongly suspect that your issues are more to do with the fact that you've upgraded, rather than specific issues with 11.10. Given your specs I'd be going for something a bit lighter myself. If you want to stick with Ubuntu, try Lubuntu (Ubuntu with the LXDE desktop) or if you're willing to try something else have a look at Mint LXDE edition. Mint is based on Ubuntu but it's prettied up a bit and a bit more user friendly (eg all the non-free codecs preinstalled). My personal favourite is Bodhi Linux. It's based on Ubuntu too, although on the older 10.04 (which is a LTS release - Long Term Support) but includes a number of updated packages and uses the awesome Enlightenment desktop. It's really lightweight like LXDE but much prettier. Like Ubuntu it's available as a live CD so you can give it a whirl without installing it. Having said all that you state that you'd rather not reinstall, so rather than posting here (on a Windows forum) I'd head over to the Ubuntu forums and post there. The likelihood of you getting someone who knows enough about Ubuntu to help you solve (or at least improve) your system woes is much higher there. I doubt there are too many Ubuntu experts hanging out on these forums. Although I could be wrong...