Comment 31 for bug 614176

John, thanks for taking the time to report this bug to make Ubuntu better!

Please try updating to the latest versions of all packages in Ubuntu to see if you still experience the invisible cursor problem. To get the cursor back, try putting your machine to sleep using the hardware buttons on your keyboard and then waking the machine up; for many of us this step restores the mouse cursor.

Then login to the desktop and update Ubuntu using the steps here:
https://help.ubuntu.com/10.04/keeping-safe/C/updates.html

Since you will be updating your kernel image, you will need to reboot the system after updating everything. The final release images of Maverick Meerkat will have the fix included. If updating to the latest package versions does not restore your mouse cursor, then please submit another report here.