I'm investigating this also. As I'm the developer/author of vboxtool, capable of auto starting and stopping sessions, this particular error came up, *after* I upgraded to Jaunty. The vboxtool scripts worked fine until then. Thus, this might me a problem related to Jaunty.
See this bug report in vboxtool (which I created my self):
https://sourceforge.net/tracker/index.p ... id=1111629
My investigations so far: starting sessions with VBoxManage in a system context (e.g. rc.local or the init.d system, used by vboxtool), is showing this error (same as posted above):
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Waiting for the remote session to open...
ERROR: Virtual machine 'Ubuntu JeOS' has terminated unexpectedly during
startup
Details: code NS_ERROR_FAILURE (0x80004005), component Machine, interface
IMachine, callee <NULL>
VBox.log is not showing errors or warnings (see attached log file on the mentioned vboxtool bug), only this:
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00:00:15.545 Changing the VM state from 'DESTROYING' to 'TERMINATED'.
Using 'export DISPLAY=:0' is not helping.