guest will only start with headless.

[elatllat]

Failed to open a session for the virtual machine Ubuntu 12.04.

The VM session was aborted.

Result Code: NS_ERROR_FAILURE (0x80004005) Component: SessionMachine Interface: ISession {12f4dcdb-12b2-4ec1-b7cd-ddd9f6c5bf4d}

[elatllat]

Workaround is to edit the .vbox xml file (ignoring the "DO NOT EDIT THIS FILE" comment).

I think this is the part of the diff that made it work:

21,24c22,24
<       <ExtraDataItem name="GUI/Fullscreen" value="on"/>
<       <ExtraDataItem name="GUI/LastGuestSizeHint" value="1077,752"/>
<       <ExtraDataItem name="GUI/LastGuestSizeHintWasFullscreen" value="true"/>
<       <ExtraDataItem name="GUI/LastNormalWindowPosition" value="735,158,1077,773"/>
---
>       <ExtraDataItem name="GUI/LastGuestSizeHint" value="640,480"/>
>       <ExtraDataItem name="GUI/LastNormalWindowPosition" value="1371,313,640,501,max"/>
>       <ExtraDataItem name="GUI/LastScaleWindowPosition" value="960,489,640,480"/>

I'm guessing the LastNormalWindowPosition or LastGuestSizeHint value was invalid for Fullscreen maybe caused by the Fullscreen bug a few versions back.

Anyway Virtualbox should not let a display 'hint' prevent the guest OS from booting.

[Dsen]

I tried to start VM with both variants from the patch above with no difference in discussed regard (I mean I was able to start VM in both cases).
Could you please try to reproduce the issue again with broken .vbox config and provide us with full .vbox file and VBox.log?
Thanks in advance!

[aeichner]

Please reopen if still relevant with a recent VirtualBox release and provide the requested information.