I am running VirtualBox on Ubuntu 8.04.1 as host, when i run VirtualBox and choose a Guest it won't boot. From the logs I get:
00:00:38.619 Changing the VM state from 'DESTROYING' to 'TERMINATED'.
00:00:38.677 ERROR [COM]: aRC=NS_ERROR_UNEXPECTED (0x8000ffff) aIID={09789f63-4525-48e5-5e4-1080453b0eab} aComponent={Display} aText={The object is not ready} aWarning=false, preserve=false
If i run VirtualBox -startvm <vm>, i get:
kiosk@kiosk:~$ VirtualBox -startvm ttt2
Xlib: extension "XInputExtension" missing on display "127.0.0.1:1.0".
Qt WARNING: Failed to get list of devices
Qt WARNING: X Error: BadWindow? (invalid Window parameter) 3
Major opcode: 3
Minor opcode: 0
Resource id: 0x20001ad
Qt WARNING: X Error: BadValue? (integer parameter out of range for operation) 2
Major opcode: 78
Minor opcode: 0
Resource id: 0xb751f130
Qt WARNING: X Error: BadDrawable? (invalid Pixmap or Window parameter) 9
Major opcode: 55
Minor opcode: 0
Resource id: 0x20001ad
Qt WARNING: X Error: BadWindow? (invalid Window parameter) 3
Major opcode: 2
Minor opcode: 0
Resource id: 0x20001ad
Qt WARNING: X Error: BadWindow? (invalid Window parameter) 3
Major opcode: 2
Minor opcode: 0
Resource id: 0x20001ad
Segmentation fault
kiosk@kiosk:~$
If i increase ulimit -c from zero (ubuntu's default) to unlimited it works most of the time.
A core dump can be found here.