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I have a Ubuntu virtualbox vm which is on virtualbox version 4.1.12, today I have upgraded to the newest version 4.2.18, and then the vm won’t be able to start, check the VBoxSVC.log(at “%HOMEDRIVE%%HOMEPATH%\.VirtualBox\” found out the following errors like:

ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={29989373-b111-4654-8493-2e1176cba890} aComponent={Medium} aText={Property ‘Special/GUI/Hints’ does not exist}, preserve=false

Dig the internet a little bit, seems related to the Guest Additions, revert the vm to previous saved snapshot(which still works), upgrade the Guest Additions from 4.1.12 to 4.2.8, reboot, the vm works again