Host machine was ported from 11.10 to 12.04 LTS (Xubuntu)
Virtualbox image is win7 x64
With upgrade /dev/vboxdrv was missing, so within synaptics I reinstalled:
- virtualbox (4.1.12dsfg-2 not OSE)
- virtualbox-qt 4.1.12dsfg
- virtualbox-dkms 4.1.12dsfg
Then it works again but my windows is badly crashed. Once started and desktop icons pops out it’s really slow and crash (network icon is also blocked)
I reinstalled guest additions, but does not make any difference.
Nothing is serious because I still have available snapshots.
I’m asking for advices, like for example how do I clean reinstall (clear parameters) vbox ?
Is there any workaround, or do I need to wait fresh 12.04LTS updates to fix this pbm by magic ?
The probably-related VirtualBox bug ticket says it is fixed in VirtualBox source, and also details a workaround via grub.
The Debian bug is here.
Hopefully the patch will be applied to Ubuntu-12.04 .
(This answer is also at: https://askubuntu.com/questions/130726/win-7-virtual-box-vm-fails-to-start-after-upgrade-to-12-04 )