I'm adding this information just so you're not confused after reading the last two posts. Upgrading the kernel is not recommended
except as a last resort attempt to fix a critical problem which would otherwise make the Linux distribution unusable. Often this
breaks something else, most commonly the graphics driver. Not being able to scroll would be questionable as being a critical problem.
I personally would probably use a USB mouse. However, before installing a different distribution, the upgrade could be attempted.
I did some extensive testing with LMDE about 6 months ago, trying to install different kernels because the present 3.2 kernel would
not allow installation of the proprietary NVidia graphics driver form the NVidia website, using the standard method of installation.
Since Ubuntu is base on Debian I installed the 3.7, 3.8 and 3.9 kernels from the link I gave in my first post and didn't experience
any problems. However, they didn't work with the downloaded Nvidia drivers either. I didn't test them long term for stability or what
effect updates would have on them.
If I planned on keeping the installed distribution then I would only attempt the upgrade after creating a backup image of the Linux
partition, or create a new partition and install the same distribution on it for testing. This link has additional information:http://askubuntu.com/questions/162616/s ... ne-kernels