Comment 2 for bug 306605

Thank you for taking the time to report this bug and helping to make Ubuntu better.
First: linux is only the kernel of the gnu/linux distribution, so this bug should be filed against this. Since there are graphical issues something like Xorg would have been a better choice. I'll do that now.
Second: You (as you said) use a developer version, even an alpha, and that is really not recommended to beginners. There often are nasty bugs and so you should rather use Intrepid.
And last: Your computer has an nvidia graphics chip. What driver do you use? You could try to use another driver and see if the problems exists there, too. And tell us, if you use compiz etc...
And attach this file to this bug report: /var/log/Xorg.0.log
Read this: https://wiki.ubuntu.com/X/Reporting
and there is also written what you have to report with your symptoms.
Anyway, thank you for helping Ubuntu. :)