After submitting, I saw this: http://wiki.centos.org/HowTos/Virtualization/VirtualBox/CentOSguest
Where the centos guys give a patch, with explanations how to apply it. After applying, the installation succeeds, and the guest additions work. I suppose that means, at the very least, that the problem is upstream. Thanks, Shai. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org