I just installed Ubuntu 9.04 64 Bit on my Acer Aspire Timeline 3810T-6415. This machine has 4GB and 500GB of hard drive space.
The only accessory I have on it is a Logitech Trackman Wheel Trackball.
The computer came with Vista but after reformatting I installed Ubuntu. After connecting to WiFi Update Manager quickly launched and had a list of updates. What is odd is if I hold my mouse pointer over the right up/down scroll bar the scroll bar starts moving down. I'm not pressing any buttons on the trackball at that time or even moving it.
Also, I opened up OpenOffice Calc and had a very similar problem. As soon as I put the mouse pointer over the actual cells within OpenOffice the cells started scrolling but not vertically, they scrolled from left to right. It does not stop. Again, I'm not pressing any buttons or moving the trackball.
I thought it may be an issue with my Logitech Trackman but I unplugged it and rebooted and have the same issue when I use the computer's trackpad. Also, I don't think it's the trackpad because I tried turning the trackpad off while having the Logitech Trackman plugged in. None of this changed anything.
I didn't use Vista that long but didn't see this issue. Could this be a setting in the BIOS? I'm using 1.10. Could it be some type of hardware problem?
What I did notice, when I selected Install Updates on the Update Manager I got the following error message:
"Could not grab your mouse. A malicious client may be eavesdropping on your session or you may have just clicked a menu or some application just decided to get focus. Try again"
All I can select is Close and try again but again, I have not been able to get beyond this point. Any idea what is causing this?

Are you running the console mouse? - 'gpm' I think its called, because I think that can cause weirdness - try turning it off(and checking the config).

Google is always your friend when troubleshooting Linux

Thanks for the advice. How do I find out if the console mouse is running? If it is, how do I turn it off? I looked on Google and was unsure of what I have to.

I'm not by my Linux machine (@ work) but I think the config file is /etc/gpm.conf & look for a program called gpm something - it'll be in one of the 'bin' directories
Theres probably a startup script in /etc/init.d called gpm something also. If you do /etc/init.d/gpm-whatever-its-name-is stop
it'll stop it until you restart.