What host/guest OS are you running?
Host : Ubuntu Jaunty Guest: Ubuntu Karmic
What version of VirtualBox/VirtualBox Guest Additions are you using?
VirtualBox: 3.0.4 r50677
When does the X sever crash (only once/sporadical/frequently/at a specific point)?
Always
Please also attach the VirtualBox log file (Main Window: Machine -> Show Log).
What host/guest OS are you running?
Host : Ubuntu Jaunty
Guest: Ubuntu Karmic
What version of VirtualBox/ VirtualBox Guest Additions are you using?
VirtualBox: 3.0.4 r50677
When does the X sever crash (only once/sporadical /frequently/ at a specific point)?
Always
Please also attach the VirtualBox log file (Main Window: Machine -> Show Log).