VirtualBox 3.0.0 might not work as expected with linux guests, like Ubuntu.. Linux users should wait a while before updating, or back up their linux VDIs beforehand.
How so? What does it do, or not do?
e.g Ubuntu 9.04 freezes/hangs in VirtualBox 3.0, while in 2.2.4 it runs just fine.. Installing 3.0 guest additions makes the problem worse.
